129632575661 has 2 divisors, whose sum is σ = 129632575662. Its totient is φ = 129632575660.

The previous prime is 129632575649. The next prime is 129632575687. The reversal of 129632575661 is 166575236921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88012495561 + 41620080100 = 296669^2 + 204010^2 .

It is a cyclic number.

It is not a de Polignac number, because 129632575661 - 2¹⁰ = 129632574637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129632575621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64816287830 + 64816287831.

It is an arithmetic number, because the mean of its divisors is an integer number (64816287831).

Almost surely, 2^129632575661 is an apocalyptic number.

It is an amenable number.

129632575661 is a deficient number, since it is larger than the sum of its proper divisors (1).

129632575661 is an equidigital number, since it uses as much as digits as its factorization.

129632575661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 53.

The spelling of 129632575661 in words is "one hundred twenty-nine billion, six hundred thirty-two million, five hundred seventy-five thousand, six hundred sixty-one".