156081555 has 48 divisors (see below), whose sum is σ = 315057600. Its totient is φ = 69997824.

The previous prime is 156081533. The next prime is 156081557. The reversal of 156081555 is 555180651.

It is not a de Polignac number, because 156081555 - 2¹⁶ = 156016019 is a prime.

It is a super-2 number, since 2×156081555² = 48722903622436050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156081557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12021 + ... + 21369.

It is an arithmetic number, because the mean of its divisors is an integer number (6563700).

Almost surely, 2^156081555 is an apocalyptic number.

156081555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

156081555 is an abundant number, since it is smaller than the sum of its proper divisors (158976045).

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

156081555 is a wasteful number, since it uses less digits than its factorization.

156081555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420 (or 9417 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 36.

The square root of 156081555 is about 12493.2603831026. The cubic root of 156081555 is about 538.4150542473.

The spelling of 156081555 in words is "one hundred fifty-six million, eighty-one thousand, five hundred fifty-five".