129977554576 has 45 divisors (see below), whose sum is σ = 253686322281. Its totient is φ = 64513606656.

The previous prime is 129977554519. The next prime is 129977554591. The reversal of 129977554576 is 675455779921.

The square root of 129977554576 is 360524.

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

It can be written as a sum of positive squares in only one way, i.e., 31492051600 + 98485502976 = 177460^2 + 313824^2 .

It is a Duffinian number.

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, 278324295 + ... + 278324761.

Almost surely, 2^129977554576 is an apocalyptic number.

129977554576 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

129977554576 is the 360524-th square number.

It is an amenable number.

129977554576 is a deficient number, since it is larger than the sum of its proper divisors (123708767705).

129977554576 is an frugal number, since it uses more digits than its factorization.

129977554576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 662 counting only the distinct ones).

The product of its digits is 166698000, while the sum is 67.

The spelling of 129977554576 in words is "one hundred twenty-nine billion, nine hundred seventy-seven million, five hundred fifty-four thousand, five hundred seventy-six".