51564671849 has 4 divisors (see below), whose sum is σ = 51565126800. Its totient is φ = 51564216900.

The previous prime is 51564671801. The next prime is 51564671863. The reversal of 51564671849 is 94817646515.

51564671849 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51564671849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51564671794 and 51564671803.

It is not an unprimeable number, because it can be changed into a prime (51564674849) 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, 93602 + ... + 334500.

It is an arithmetic number, because the mean of its divisors is an integer number (12891281700).

Almost surely, 2^51564671849 is an apocalyptic number.

It is an amenable number.

51564671849 is a deficient number, since it is larger than the sum of its proper divisors (454951).

51564671849 is a wasteful number, since it uses less digits than its factorization.

51564671849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454950.

The product of its digits is 7257600, while the sum is 56.

The spelling of 51564671849 in words is "fifty-one billion, five hundred sixty-four million, six hundred seventy-one thousand, eight hundred forty-nine".