68531656645 has 8 divisors (see below), whose sum is σ = 82373474304. Its totient is φ = 54735001104.

The previous prime is 68531656637. The next prime is 68531656663. The reversal of 68531656645 is 54665613586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68531656645 - 2³ = 68531656637 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 11287189 + ... + 11293258.

It is an arithmetic number, because the mean of its divisors is an integer number (10296684288).

Almost surely, 2^68531656645 is an apocalyptic number.

It is an amenable number.

68531656645 is a deficient number, since it is larger than the sum of its proper divisors (13841817659).

68531656645 is a wasteful number, since it uses less digits than its factorization.

68531656645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22581059.

The product of its digits is 15552000, while the sum is 55.

The spelling of 68531656645 in words is "sixty-eight billion, five hundred thirty-one million, six hundred fifty-six thousand, six hundred forty-five".