56878784566 has 4 divisors (see below), whose sum is σ = 85318176852. Its totient is φ = 28439392282.

The previous prime is 56878784537. The next prime is 56878784621. The reversal of 56878784566 is 66548787865.

It is a happy number.

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

It is a super-2 number, since 2×56878784566² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56878784495 and 56878784504.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 14219696140 + ... + 14219696143.

It is an arithmetic number, because the mean of its divisors is an integer number (21329544213).

Almost surely, 2^56878784566 is an apocalyptic number.

56878784566 is a deficient number, since it is larger than the sum of its proper divisors (28439392286).

56878784566 is a wasteful number, since it uses less digits than its factorization.

56878784566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28439392285.

The product of its digits is 541900800, while the sum is 70.

The spelling of 56878784566 in words is "fifty-six billion, eight hundred seventy-eight million, seven hundred eighty-four thousand, five hundred sixty-six".