68995551655 has 4 divisors (see below), whose sum is σ = 82794661992. Its totient is φ = 55196441320.

The previous prime is 68995551623. The next prime is 68995551661. The reversal of 68995551655 is 55615559986.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 68995551655 - 2⁵ = 68995551623 is a prime.

It is a super-2 number, since 2×68995551655² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6899555161 + ... + 6899555170.

It is an arithmetic number, because the mean of its divisors is an integer number (20698665498).

Almost surely, 2^68995551655 is an apocalyptic number.

68995551655 is a deficient number, since it is larger than the sum of its proper divisors (13799110337).

68995551655 is a wasteful number, since it uses less digits than its factorization.

68995551655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13799110336.

The product of its digits is 72900000, while the sum is 64.

The spelling of 68995551655 in words is "sixty-eight billion, nine hundred ninety-five million, five hundred fifty-one thousand, six hundred fifty-five".