68692697581 has 16 divisors (see below), whose sum is σ = 70039698624. Its totient is φ = 67355887104.

The previous prime is 68692697569. The next prime is 68692697597. The reversal of 68692697581 is 18579629686.

It is a cyclic number.

It is not a de Polignac number, because 68692697581 - 2²⁷ = 68558479853 is a prime.

It is a super-2 number, since 2×68692697581² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68692697081) 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, 15205335 + ... + 15209851.

It is an arithmetic number, because the mean of its divisors is an integer number (4377481164).

Almost surely, 2^68692697581 is an apocalyptic number.

It is an amenable number.

68692697581 is a deficient number, since it is larger than the sum of its proper divisors (1347001043).

68692697581 is a wasteful number, since it uses less digits than its factorization.

68692697581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580.

The product of its digits is 78382080, while the sum is 67.

The spelling of 68692697581 in words is "sixty-eight billion, six hundred ninety-two million, six hundred ninety-seven thousand, five hundred eighty-one".