55638477432591 has 4 divisors (see below), whose sum is σ = 74184636576792. Its totient is φ = 37092318288392.

The previous prime is 55638477432583. The next prime is 55638477432613. The reversal of 55638477432591 is 19523477483655.

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 55638477432591 - 2³ = 55638477432583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55638477432521) 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, 9273079572096 + ... + 9273079572101.

It is an arithmetic number, because the mean of its divisors is an integer number (18546159144198).

Almost surely, 2^{55638477432591} is an apocalyptic number.

55638477432591 is a deficient number, since it is larger than the sum of its proper divisors (18546159144201).

55638477432591 is a wasteful number, since it uses less digits than its factorization.

55638477432591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18546159144200.

The product of its digits is 762048000, while the sum is 69.

The spelling of 55638477432591 in words is "fifty-five trillion, six hundred thirty-eight billion, four hundred seventy-seven million, four hundred thirty-two thousand, five hundred ninety-one".