129661553136 has 40 divisors (see below), whose sum is σ = 349522450560. Its totient is φ = 41341364416.

The previous prime is 129661553123. The next prime is 129661553141. The reversal of 129661553136 is 631355166921.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58722426 + ... + 58724633.

It is an arithmetic number, because the mean of its divisors is an integer number (8738061264).

Almost surely, 2^129661553136 is an apocalyptic number.

129661553136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129661553136 is an abundant number, since it is smaller than the sum of its proper divisors (219860897424).

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

129661553136 is a wasteful number, since it uses less digits than its factorization.

129661553136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117447093 (or 117447087 counting only the distinct ones).

The product of its digits is 874800, while the sum is 48.

The spelling of 129661553136 in words is "one hundred twenty-nine billion, six hundred sixty-one million, five hundred fifty-three thousand, one hundred thirty-six".