56605729591 has 4 divisors (see below), whose sum is σ = 57986357184. Its totient is φ = 55225102000.

The previous prime is 56605729451. The next prime is 56605729657. The reversal of 56605729591 is 19592750665.

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 56605729591 - 2²³ = 56597340983 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 (56605729391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690313735 + ... + 690313816.

It is an arithmetic number, because the mean of its divisors is an integer number (14496589296).

Almost surely, 2^56605729591 is an apocalyptic number.

56605729591 is a deficient number, since it is larger than the sum of its proper divisors (1380627593).

56605729591 is a wasteful number, since it uses less digits than its factorization.

56605729591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380627592.

The product of its (nonzero) digits is 5103000, while the sum is 55.

The spelling of 56605729591 in words is "fifty-six billion, six hundred five million, seven hundred twenty-nine thousand, five hundred ninety-one".