129560454972 has 72 divisors (see below), whose sum is σ = 354731255424. Its totient is φ = 39634298496.

The previous prime is 129560454953. The next prime is 129560454979. The reversal of 129560454972 is 279454065921.

It is a happy number.

129560454972 is a `hidden beast` number, since 1 + 2 + 9 + 560 + 4 + 5 + 4 + 9 + 72 = 666.

It is a super-2 number, since 2×129560454972² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129560454979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 719148 + ... + 881075.

It is an arithmetic number, because the mean of its divisors is an integer number (4926822992).

Almost surely, 2^129560454972 is an apocalyptic number.

129560454972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129560454972 is an abundant number, since it is smaller than the sum of its proper divisors (225170800452).

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

129560454972 is a wasteful number, since it uses less digits than its factorization.

129560454972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600419 (or 1600414 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 129560454972 in words is "one hundred twenty-nine billion, five hundred sixty million, four hundred fifty-four thousand, nine hundred seventy-two".