55666523639 has 8 divisors (see below), whose sum is σ = 56738119200. Its totient is φ = 54605085696.

The previous prime is 55666523629. The next prime is 55666523669. The reversal of 55666523639 is 93632566655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55666523639 - 2⁴ = 55666523623 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 (55666523629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2528339 + ... + 2550260.

It is an arithmetic number, because the mean of its divisors is an integer number (7092264900).

Almost surely, 2^55666523639 is an apocalyptic number.

55666523639 is a deficient number, since it is larger than the sum of its proper divisors (1071595561).

55666523639 is a wasteful number, since it uses less digits than its factorization.

55666523639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078809.

The product of its digits is 26244000, while the sum is 56.

The spelling of 55666523639 in words is "fifty-five billion, six hundred sixty-six million, five hundred twenty-three thousand, six hundred thirty-nine".