78979121956 has 12 divisors (see below), whose sum is σ = 157958243968. Its totient is φ = 33848195112.

The previous prime is 78979121953. The next prime is 78979121957. The reversal of 78979121956 is 65912197987.

78979121956 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (78979121953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1410341436 + ... + 1410341491.

Almost surely, 2^78979121956 is an apocalyptic number.

It is an amenable number.

78979121956 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.

78979121956 is a wasteful number, since it uses less digits than its factorization.

78979121956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820682938 (or 2820682936 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 64.

The spelling of 78979121956 in words is "seventy-eight billion, nine hundred seventy-nine million, one hundred twenty-one thousand, nine hundred fifty-six".