129418970640 has 80 divisors (see below), whose sum is σ = 409734989568. Its totient is φ = 33777430528.

The previous prime is 129418970621. The next prime is 129418970699. The reversal of 129418970640 is 46079814921.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5725377 + ... + 5747936.

Almost surely, 2^129418970640 is an apocalyptic number.

129418970640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129418970640 is an abundant number, since it is smaller than the sum of its proper divisors (280316018928).

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

129418970640 is a wasteful number, since it uses less digits than its factorization.

129418970640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11473376 (or 11473370 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 129418970640 in words is "one hundred twenty-nine billion, four hundred eighteen million, nine hundred seventy thousand, six hundred forty".