56505511511 has 4 divisors (see below), whose sum is σ = 56657001192. Its totient is φ = 56354021832.

The previous prime is 56505511499. The next prime is 56505511537. The reversal of 56505511511 is 11511550565.

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-56505511511 is a prime.

It is a super-2 number, since 2×56505511511² (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 (56565511511) 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, 75744281 + ... + 75745026.

It is an arithmetic number, because the mean of its divisors is an integer number (14164250298).

Almost surely, 2^56505511511 is an apocalyptic number.

56505511511 is a deficient number, since it is larger than the sum of its proper divisors (151489681).

56505511511 is a wasteful number, since it uses less digits than its factorization.

56505511511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151489680.

The product of its (nonzero) digits is 18750, while the sum is 35.

The spelling of 56505511511 in words is "fifty-six billion, five hundred five million, five hundred eleven thousand, five hundred eleven".