17955513856 has 40 divisors (see below), whose sum is σ = 41001103440. Its totient is φ = 7695218688.

The previous prime is 17955513853. The next prime is 17955513857. The reversal of 17955513856 is 65831555971.

It is a junction number, because it is equal to n+sod(n) for n = 17955513797 and 17955513806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17955513853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501371 + ... + 2508538.

It is an arithmetic number, because the mean of its divisors is an integer number (1025027586).

Almost surely, 2^17955513856 is an apocalyptic number.

17955513856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

17955513856 is an abundant number, since it is smaller than the sum of its proper divisors (23045589584).

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

17955513856 is an frugal number, since it uses more digits than its factorization.

17955513856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009934 (or 5009918 counting only the distinct ones).

The product of its digits is 5670000, while the sum is 55.

The spelling of 17955513856 in words is "seventeen billion, nine hundred fifty-five million, five hundred thirteen thousand, eight hundred fifty-six".