68722589691 has 24 divisors (see below), whose sum is σ = 115306605024. Its totient is φ = 38626277760.

The previous prime is 68722589669. The next prime is 68722589713. The reversal of 68722589691 is 19698522786.

It is an interprime number because it is at equal distance from previous prime (68722589669) and next prime (68722589713).

It is not a de Polignac number, because 68722589691 - 2⁹ = 68722589179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (68722589191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8937426 + ... + 8945111.

It is an arithmetic number, because the mean of its divisors is an integer number (4804441876).

Almost surely, 2^68722589691 is an apocalyptic number.

68722589691 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

68722589691 is a deficient number, since it is larger than the sum of its proper divisors (46584015333).

68722589691 is a wasteful number, since it uses less digits than its factorization.

68722589691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17882611 (or 17882608 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 68722589691 in words is "sixty-eight billion, seven hundred twenty-two million, five hundred eighty-nine thousand, six hundred ninety-one".