78965989770778 has 32 divisors (see below), whose sum is σ = 130266384703488. Its totient is φ = 35602294820400.

The previous prime is 78965989770727. The next prime is 78965989770781. The reversal of 78965989770778 is 87707798956987.

It is a self number, because there is not a number n which added to its sum of digits gives 78965989770778.

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, 7976001 + ... + 14884507.

It is an arithmetic number, because the mean of its divisors is an integer number (4070824521984).

Almost surely, 2^{78965989770778} is an apocalyptic number.

78965989770778 is a deficient number, since it is larger than the sum of its proper divisors (51300394932710).

78965989770778 is a wasteful number, since it uses less digits than its factorization.

78965989770778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6912738.

The product of its (nonzero) digits is 188195374080, while the sum is 97.

The spelling of 78965989770778 in words is "seventy-eight trillion, nine hundred sixty-five billion, nine hundred eighty-nine million, seven hundred seventy thousand, seven hundred seventy-eight".