129806757961 has 2 divisors, whose sum is σ = 129806757962. Its totient is φ = 129806757960.

The previous prime is 129806757943. The next prime is 129806758063. The reversal of 129806757961 is 169757608921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112866433936 + 16940324025 = 335956^2 + 130155^2 .

It is an emirp because it is prime and its reverse (169757608921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129806757961 - 2²¹ = 129804660809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129806757961.

It is not a weakly prime, because it can be changed into another prime (129806757461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64903378980 + 64903378981.

It is an arithmetic number, because the mean of its divisors is an integer number (64903378981).

Almost surely, 2^129806757961 is an apocalyptic number.

It is an amenable number.

129806757961 is a deficient number, since it is larger than the sum of its proper divisors (1).

129806757961 is an equidigital number, since it uses as much as digits as its factorization.

129806757961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 129806757961 in words is "one hundred twenty-nine billion, eight hundred six million, seven hundred fifty-seven thousand, nine hundred sixty-one".