51895664747 has 4 divisors (see below), whose sum is σ = 52007750880. Its totient is φ = 51783578616.

The previous prime is 51895664707. The next prime is 51895664789. The reversal of 51895664747 is 74746659815.

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-51895664747 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 51895664747.

It is not an unprimeable number, because it can be changed into a prime (51895664707) 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, 56042372 + ... + 56043297.

It is an arithmetic number, because the mean of its divisors is an integer number (13001937720).

Almost surely, 2^51895664747 is an apocalyptic number.

51895664747 is a deficient number, since it is larger than the sum of its proper divisors (112086133).

51895664747 is a wasteful number, since it uses less digits than its factorization.

51895664747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112086132.

The product of its digits is 50803200, while the sum is 62.

The spelling of 51895664747 in words is "fifty-one billion, eight hundred ninety-five million, six hundred sixty-four thousand, seven hundred forty-seven".