129457979868 has 48 divisors (see below), whose sum is σ = 345346663424. Its totient is φ = 36974560320.

The previous prime is 129457979867. The next prime is 129457979869. The reversal of 129457979868 is 868979754921.

It is an interprime number because it is at equal distance from previous prime (129457979867) and next prime (129457979869).

It is a self number, because there is not a number n which added to its sum of digits gives 129457979868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129457979863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46063 + ... + 510918.

Almost surely, 2^129457979868 is an apocalyptic number.

It is an amenable number.

129457979868 is an abundant number, since it is smaller than the sum of its proper divisors (215888683556).

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

129457979868 is a wasteful number, since it uses less digits than its factorization.

129457979868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559762 (or 559760 counting only the distinct ones).

The product of its digits is 548674560, while the sum is 75.

The spelling of 129457979868 in words is "one hundred twenty-nine billion, four hundred fifty-seven million, nine hundred seventy-nine thousand, eight hundred sixty-eight".