155999616 has 128 divisors (see below), whose sum is σ = 458265600. Its totient is φ = 46768128.

The previous prime is 155999603. The next prime is 155999653. The reversal of 155999616 is 616999551.

It is a happy number.

155999616 is a nontrivial binomial coefficient, being equal to C(17664, 2).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149625 + ... + 150663.

It is an arithmetic number, because the mean of its divisors is an integer number (3580200).

Almost surely, 2^155999616 is an apocalyptic number.

155999616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

155999616 is the 17663-rd triangular number and also the 8832-nd hexagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155999616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229132800).

155999616 is an abundant number, since it is smaller than the sum of its proper divisors (302265984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155999616 is a wasteful number, since it uses less digits than its factorization.

155999616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096 (or 1084 counting only the distinct ones).

The product of its digits is 656100, while the sum is 51.

The square root of 155999616 is about 12489.9806244846. The cubic root of 155999616 is about 538.3208195089.

The spelling of 155999616 in words is "one hundred fifty-five million, nine hundred ninety-nine thousand, six hundred sixteen".