68645512155 has 32 divisors (see below), whose sum is σ = 125027089920. Its totient is φ = 31835598080.

The previous prime is 68645512147. The next prime is 68645512171. The reversal of 68645512155 is 55121554686.

It is not a de Polignac number, because 68645512155 - 2³ = 68645512147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9040410 + ... + 9047999.

It is an arithmetic number, because the mean of its divisors is an integer number (3907096560).

Almost surely, 2^68645512155 is an apocalyptic number.

68645512155 is a deficient number, since it is larger than the sum of its proper divisors (56381577765).

68645512155 is a wasteful number, since it uses less digits than its factorization.

68645512155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18088451.

The product of its digits is 1440000, while the sum is 48.

The spelling of 68645512155 in words is "sixty-eight billion, six hundred forty-five million, five hundred twelve thousand, one hundred fifty-five".