56671573687 has 4 divisors (see below), whose sum is σ = 56673060136. Its totient is φ = 56670087240.

The previous prime is 56671573681. The next prime is 56671573753. The reversal of 56671573687 is 78637517665.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 56671573687 - 2⁷ = 56671573559 is a prime.

It is a super-2 number, since 2×56671573687² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56671573681) 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, 684489 + ... + 762802.

It is an arithmetic number, because the mean of its divisors is an integer number (14168265034).

Almost surely, 2^56671573687 is an apocalyptic number.

56671573687 is a deficient number, since it is larger than the sum of its proper divisors (1486449).

56671573687 is a wasteful number, since it uses less digits than its factorization.

56671573687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486448.

The product of its digits is 44452800, while the sum is 61.

The spelling of 56671573687 in words is "fifty-six billion, six hundred seventy-one million, five hundred seventy-three thousand, six hundred eighty-seven".