129820911634404 has 27 divisors (see below), whose sum is σ = 328158588327843. Its totient is φ = 43273614423672.

The previous prime is 129820911634399. The next prime is 129820911634537. The reversal of 129820911634404 is 404436119028921.

The square root of 129820911634404 is 11393898.

It is a perfect power (a square), and thus also a powerful number.

129820911634404 is a `hidden beast` number, since 1 + 2 + 9 + 82 + 0 + 9 + 116 + 3 + 440 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 67413897 + ... + 69312879.

Almost surely, 2^{129820911634404} is an apocalyptic number.

129820911634404 is the 11393898-th square number.

It is an amenable number.

129820911634404 is an abundant number, since it is smaller than the sum of its proper divisors (198337676693439).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129820911634404 is an frugal number, since it uses more digits than its factorization.

129820911634404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797976 (or 1898988 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 129820911634404 in words is "one hundred twenty-nine trillion, eight hundred twenty billion, nine hundred eleven million, six hundred thirty-four thousand, four hundred four".