129791587657 has 2 divisors, whose sum is σ = 129791587658. Its totient is φ = 129791587656.

The previous prime is 129791587637. The next prime is 129791587691. The reversal of 129791587657 is 756785197921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100854515776 + 28937071881 = 317576^2 + 170109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129791587657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129791587592 and 129791587601.

It is not a weakly prime, because it can be changed into another prime (129791587637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64895793828 + 64895793829.

It is an arithmetic number, because the mean of its divisors is an integer number (64895793829).

Almost surely, 2^129791587657 is an apocalyptic number.

It is an amenable number.

129791587657 is a deficient number, since it is larger than the sum of its proper divisors (1).

129791587657 is an equidigital number, since it uses as much as digits as its factorization.

129791587657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66679200, while the sum is 67.

The spelling of 129791587657 in words is "one hundred twenty-nine billion, seven hundred ninety-one million, five hundred eighty-seven thousand, six hundred fifty-seven".