978256652879 has 4 divisors (see below), whose sum is σ = 1067189075880. Its totient is φ = 889324229880.

The previous prime is 978256652869. The next prime is 978256652897.

978256652879 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978256652879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978256652869) 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, 44466211484 + ... + 44466211505.

It is an arithmetic number, because the mean of its divisors is an integer number (266797268970).

Almost surely, 2^978256652879 is an apocalyptic number.

978256652879 is a deficient number, since it is larger than the sum of its proper divisors (88932423001).

978256652879 is a wasteful number, since it uses less digits than its factorization.

978256652879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88932423000.

The product of its digits is 914457600, while the sum is 74.

The spelling of 978256652879 in words is "nine hundred seventy-eight billion, two hundred fifty-six million, six hundred fifty-two thousand, eight hundred seventy-nine".