155660605605 has 64 divisors (see below), whose sum is σ = 279548755200. Its totient is φ = 82174659840.

The previous prime is 155660605603. The next prime is 155660605619. The reversal of 155660605605 is 506506066551.

It is not a de Polignac number, because 155660605605 - 2¹ = 155660605603 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155660605603) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20638135 + ... + 20645675.

It is an arithmetic number, because the mean of its divisors is an integer number (4367949300).

Almost surely, 2^155660605605 is an apocalyptic number.

155660605605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155660605605 is a deficient number, since it is larger than the sum of its proper divisors (123888149595).

155660605605 is a wasteful number, since it uses less digits than its factorization.

155660605605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9091 (or 9085 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 155660605605 in words is "one hundred fifty-five billion, six hundred sixty million, six hundred five thousand, six hundred five".