51564984613 has 16 divisors (see below), whose sum is σ = 55132230960. Its totient is φ = 48058822656.

The previous prime is 51564984439. The next prime is 51564984629. The reversal of 51564984613 is 31648946515.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 173001409 + 51391983204 = 13153^2 + 226698^2 .

It is not a de Polignac number, because 51564984613 - 2⁹ = 51564984101 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 (51564984643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 925495 + ... + 979627.

It is an arithmetic number, because the mean of its divisors is an integer number (3445764435).

Almost surely, 2^51564984613 is an apocalyptic number.

It is an amenable number.

51564984613 is a deficient number, since it is larger than the sum of its proper divisors (3567246347).

51564984613 is a wasteful number, since it uses less digits than its factorization.

51564984613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54696.

The product of its digits is 3110400, while the sum is 52.

The spelling of 51564984613 in words is "fifty-one billion, five hundred sixty-four million, nine hundred eighty-four thousand, six hundred thirteen".