77975328129808 has 20 divisors (see below), whose sum is σ = 151679099447568. Its totient is φ = 38832334724000.

The previous prime is 77975328129781. The next prime is 77975328129827. The reversal of 77975328129808 is 80892182357977.

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, 9708079666 + ... + 9708087697.

Almost surely, 2^{77975328129808} is an apocalyptic number.

It is an amenable number.

77975328129808 is a deficient number, since it is larger than the sum of its proper divisors (73703771317760).

77975328129808 is a wasteful number, since it uses less digits than its factorization.

77975328129808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19416167622 (or 19416167616 counting only the distinct ones).

The product of its (nonzero) digits is 853493760, while the sum is 76.

The spelling of 77975328129808 in words is "seventy-seven trillion, nine hundred seventy-five billion, three hundred twenty-eight million, one hundred twenty-nine thousand, eight hundred eight".