56911663 has 4 divisors (see below), whose sum is σ = 56957440. Its totient is φ = 56865888.

The previous prime is 56911643. The next prime is 56911681. The reversal of 56911663 is 36611965.

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-56911663 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 (56911633) 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, 20970 + ... + 23527.

It is an arithmetic number, because the mean of its divisors is an integer number (14239360).

Almost surely, 2^56911663 is an apocalyptic number.

56911663 is a deficient number, since it is larger than the sum of its proper divisors (45777).

56911663 is a wasteful number, since it uses less digits than its factorization.

56911663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45776.

The product of its digits is 29160, while the sum is 37.

The square root of 56911663 is about 7543.9819061289. The cubic root of 56911663 is about 384.6512003683.

The spelling of 56911663 in words is "fifty-six million, nine hundred eleven thousand, six hundred sixty-three".