12919861957 has 2 divisors, whose sum is σ = 12919861958. Its totient is φ = 12919861956.

The previous prime is 12919861951. The next prime is 12919862017. The reversal of 12919861957 is 75916891921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10766345121 + 2153516836 = 103761^2 + 46406^2 .

It is a cyclic number.

It is not a de Polignac number, because 12919861957 - 2²³ = 12911473349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12919861951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459930978 + 6459930979.

It is an arithmetic number, because the mean of its divisors is an integer number (6459930979).

Almost surely, 2^12919861957 is an apocalyptic number.

It is an amenable number.

12919861957 is a deficient number, since it is larger than the sum of its proper divisors (1).

12919861957 is an equidigital number, since it uses as much as digits as its factorization.

12919861957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 58.

The spelling of 12919861957 in words is "twelve billion, nine hundred nineteen million, eight hundred sixty-one thousand, nine hundred fifty-seven".