68915172645 has 144 divisors (see below), whose sum is σ = 138963427200. Its totient is φ = 31326566400.

The previous prime is 68915172583. The next prime is 68915172661. The reversal of 68915172645 is 54627151986.

It is a happy number.

68915172645 is a `hidden beast` number, since 6 + 89 + 1 + 517 + 2 + 6 + 45 = 666.

It is not a de Polignac number, because 68915172645 - 2⁶ = 68915172581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68915172591 and 68915172600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 44489331 + ... + 44490879.

It is an arithmetic number, because the mean of its divisors is an integer number (965023800).

Almost surely, 2^68915172645 is an apocalyptic number.

It is an amenable number.

68915172645 is an abundant number, since it is smaller than the sum of its proper divisors (70048254555).

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

68915172645 is a wasteful number, since it uses less digits than its factorization.

68915172645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1896 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 68915172645 in words is "sixty-eight billion, nine hundred fifteen million, one hundred seventy-two thousand, six hundred forty-five".