68146445531 has 16 divisors (see below), whose sum is σ = 73752073344. Its totient is φ = 62720553984.

The previous prime is 68146445527. The next prime is 68146445561. The reversal of 68146445531 is 13554464186.

It is not a de Polignac number, because 68146445531 - 2² = 68146445527 is a prime.

It is a super-2 number, since 2×68146445531² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68146445561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 934031 + ... + 1004343.

It is an arithmetic number, because the mean of its divisors is an integer number (4609504584).

Almost surely, 2^68146445531 is an apocalyptic number.

68146445531 is a deficient number, since it is larger than the sum of its proper divisors (5605627813).

68146445531 is a wasteful number, since it uses less digits than its factorization.

68146445531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71590.

The product of its digits is 1382400, while the sum is 47.

The spelling of 68146445531 in words is "sixty-eight billion, one hundred forty-six million, four hundred forty-five thousand, five hundred thirty-one".