51564404023 has 4 divisors (see below), whose sum is σ = 56252077128. Its totient is φ = 46876730920.

The previous prime is 51564404009. The next prime is 51564404069. The reversal of 51564404023 is 32040446515.

51564404023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51564404023 - 2²¹ = 51562306871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51564404023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51564404083) 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, 2343836536 + ... + 2343836557.

It is an arithmetic number, because the mean of its divisors is an integer number (14063019282).

Almost surely, 2^51564404023 is an apocalyptic number.

51564404023 is a deficient number, since it is larger than the sum of its proper divisors (4687673105).

51564404023 is a wasteful number, since it uses less digits than its factorization.

51564404023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687673104.

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 51564404023 in words is "fifty-one billion, five hundred sixty-four million, four hundred four thousand, twenty-three".