129942894956 has 12 divisors (see below), whose sum is σ = 259885789968. Its totient is φ = 55689812112.

The previous prime is 129942894943. The next prime is 129942894971. The reversal of 129942894956 is 659498249921.

It is a happy number.

129942894956 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2320408811 + ... + 2320408866.

It is an arithmetic number, because the mean of its divisors is an integer number (21657149164).

Almost surely, 2^129942894956 is an apocalyptic number.

It is an amenable number.

129942894956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129942894956 is a wasteful number, since it uses less digits than its factorization.

129942894956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4640817688 (or 4640817686 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 68.

The spelling of 129942894956 in words is "one hundred twenty-nine billion, nine hundred forty-two million, eight hundred ninety-four thousand, nine hundred fifty-six".