19971078056 has 16 divisors (see below), whose sum is σ = 38737005300. Its totient is φ = 9641209984.

The previous prime is 19971078053. The next prime is 19971078059. The reversal of 19971078056 is 65087017991.

It is an interprime number because it is at equal distance from previous prime (19971078053) and next prime (19971078059).

It can be written as a sum of positive squares in 2 ways, for example, as 19962864100 + 8213956 = 141290^2 + 2866^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19971077989 and 19971078007.

It is not an unprimeable number, because it can be changed into a prime (19971078053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43040885 + ... + 43041348.

Almost surely, 2^19971078056 is an apocalyptic number.

It is an amenable number.

19971078056 is a deficient number, since it is larger than the sum of its proper divisors (18765927244).

19971078056 is a wasteful number, since it uses less digits than its factorization.

19971078056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86082268 (or 86082264 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 53.

The spelling of 19971078056 in words is "nineteen billion, nine hundred seventy-one million, seventy-eight thousand, fifty-six".