51201865971 has 6 divisors (see below), whose sum is σ = 73958250860. Its totient is φ = 34134577308.

The previous prime is 51201865961. The next prime is 51201866003. The reversal of 51201865971 is 17956810215.

51201865971 is a `hidden beast` number, since 51 + 2 + 0 + 1 + 8 + 6 + 597 + 1 = 666.

It is not a de Polignac number, because 51201865971 - 2⁹ = 51201865459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51201865961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2844548101 + ... + 2844548118.

Almost surely, 2^51201865971 is an apocalyptic number.

51201865971 is a deficient number, since it is larger than the sum of its proper divisors (22756384889).

51201865971 is a wasteful number, since it uses less digits than its factorization.

51201865971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689096225 (or 5689096222 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 45.

The spelling of 51201865971 in words is "fifty-one billion, two hundred one million, eight hundred sixty-five thousand, nine hundred seventy-one".