68772651931 has 2 divisors, whose sum is σ = 68772651932. Its totient is φ = 68772651930.

The previous prime is 68772651917. The next prime is 68772651947. The reversal of 68772651931 is 13915627786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68772651931 - 2⁹ = 68772651419 is a prime.

It is a super-2 number, since 2×68772651931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68772651901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34386325965 + 34386325966.

It is an arithmetic number, because the mean of its divisors is an integer number (34386325966).

Almost surely, 2^68772651931 is an apocalyptic number.

68772651931 is a deficient number, since it is larger than the sum of its proper divisors (1).

68772651931 is an equidigital number, since it uses as much as digits as its factorization.

68772651931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 55.

The spelling of 68772651931 in words is "sixty-eight billion, seven hundred seventy-two million, six hundred fifty-one thousand, nine hundred thirty-one".