51739999947 has 12 divisors (see below), whose sum is σ = 74743970080. Its totient is φ = 34489449648.

The previous prime is 51739999933. The next prime is 51739999957. The reversal of 51739999947 is 74999993715.

It is not a de Polignac number, because 51739999947 - 2⁸ = 51739999691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51739999957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238072 + ... + 400197.

Almost surely, 2^51739999947 is an apocalyptic number.

51739999947 is a deficient number, since it is larger than the sum of its proper divisors (23003970133).

51739999947 is a wasteful number, since it uses less digits than its factorization.

51739999947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647282 (or 647279 counting only the distinct ones).

The product of its digits is 173604060, while the sum is 72.

The spelling of 51739999947 in words is "fifty-one billion, seven hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred forty-seven".