155615856 has 80 divisors (see below), whose sum is σ = 453720960. Its totient is φ = 45525760.

The previous prime is 155615737. The next prime is 155615857. The reversal of 155615856 is 658516551.

It is a super-2 number, since 2×155615856² = 48432589277225472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155615857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10231 + ... + 20393.

It is an arithmetic number, because the mean of its divisors is an integer number (5671512).

Almost surely, 2^155615856 is an apocalyptic number.

155615856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155615856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226860480).

155615856 is an abundant number, since it is smaller than the sum of its proper divisors (298105104).

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

155615856 is a wasteful number, since it uses less digits than its factorization.

155615856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10214 (or 10208 counting only the distinct ones).

The product of its digits is 180000, while the sum is 42.

The square root of 155615856 is about 12474.6084507691. The cubic root of 155615856 is about 537.8790328861.

The spelling of 155615856 in words is "one hundred fifty-five million, six hundred fifteen thousand, eight hundred fifty-six".