68428745507161 has 12 divisors (see below), whose sum is σ = 74777191652460. Its totient is φ = 62585500461120.

The previous prime is 68428745507149. The next prime is 68428745507207. The reversal of 68428745507161 is 16170554782486.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13782054831561 + 54646690675600 = 3712419^2 + 7392340^2 .

It is not a de Polignac number, because 68428745507161 - 2²⁷ = 68428611289433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68428745507093 and 68428745507102.

It is not an unprimeable number, because it can be changed into a prime (68428745507761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1857338550 + ... + 1857375391.

It is an arithmetic number, because the mean of its divisors is an integer number (6231432637705).

Almost surely, 2^{68428745507161} is an apocalyptic number.

It is an amenable number.

68428745507161 is a deficient number, since it is larger than the sum of its proper divisors (6348446145299).

68428745507161 is a wasteful number, since it uses less digits than its factorization.

68428745507161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714714076 (or 3714714063 counting only the distinct ones).

The product of its (nonzero) digits is 90316800, while the sum is 64.

The spelling of 68428745507161 in words is "sixty-eight trillion, four hundred twenty-eight billion, seven hundred forty-five million, five hundred seven thousand, one hundred sixty-one".