68156534281 has 16 divisors (see below), whose sum is σ = 74995502400. Its totient is φ = 61426008000.

The previous prime is 68156534263. The next prime is 68156534293. The reversal of 68156534281 is 18243565186.

It is a cyclic number.

It is not a de Polignac number, because 68156534281 - 2⁹ = 68156533769 is a prime.

It is a super-2 number, since 2×68156534281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68156504281) 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, 1040035 + ... + 1103623.

It is an arithmetic number, because the mean of its divisors is an integer number (4687218900).

Almost surely, 2^68156534281 is an apocalyptic number.

It is an amenable number.

68156534281 is a deficient number, since it is larger than the sum of its proper divisors (6838968119).

68156534281 is a wasteful number, since it uses less digits than its factorization.

68156534281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64440.

The product of its digits is 1382400, while the sum is 49.

The spelling of 68156534281 in words is "sixty-eight billion, one hundred fifty-six million, five hundred thirty-four thousand, two hundred eighty-one".