129766045521 has 16 divisors (see below), whose sum is σ = 197761270784. Its totient is φ = 74143575504.

The previous prime is 129766045501. The next prime is 129766045537. The reversal of 129766045521 is 125540667921.

It is not a de Polignac number, because 129766045521 - 2²² = 129761851217 is a prime.

It is a super-2 number, since 2×129766045521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129766045501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161035 + ... + 534288.

It is an arithmetic number, because the mean of its divisors is an integer number (12360079424).

Almost surely, 2^129766045521 is an apocalyptic number.

It is an amenable number.

129766045521 is a deficient number, since it is larger than the sum of its proper divisors (67995225263).

129766045521 is an equidigital number, since it uses as much as digits as its factorization.

129766045521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704220.

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 129766045521 in words is "one hundred twenty-nine billion, seven hundred sixty-six million, forty-five thousand, five hundred twenty-one".