155994660 has 60 divisors (see below), whose sum is σ = 489366108. Its totient is φ = 41598144.

The previous prime is 155994653. The next prime is 155994667. The reversal of 155994660 is 66499551.

It is a happy number.

155994660 is a `hidden beast` number, since 1 + 559 + 94 + 6 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (155994653) and next prime (155994667).

It can be written as a sum of positive squares in 2 ways, for example, as 67371264 + 88623396 = 8208^2 + 9414^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155994667) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 46527 + ... + 49766.

Almost surely, 2^155994660 is an apocalyptic number.

155994660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155994660 is an abundant number, since it is smaller than the sum of its proper divisors (333371448).

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

155994660 is a wasteful number, since it uses less digits than its factorization.

155994660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96314 (or 96303 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 155994660 is about 12489.7822238820. The cubic root of 155994660 is about 538.3151187550.

The spelling of 155994660 in words is "one hundred fifty-five million, nine hundred ninety-four thousand, six hundred sixty".