51739739517 has 16 divisors (see below), whose sum is σ = 69501848960. Its totient is φ = 34235877312.

The previous prime is 51739739507. The next prime is 51739739533. The reversal of 51739739517 is 71593793715.

It is a happy number.

It is not a de Polignac number, because 51739739517 - 2⁴ = 51739739501 is a prime.

It is a super-2 number, since 2×51739739517² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51739739507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373083 + ... + 492615.

It is an arithmetic number, because the mean of its divisors is an integer number (4343865560).

Almost surely, 2^51739739517 is an apocalyptic number.

It is an amenable number.

51739739517 is a deficient number, since it is larger than the sum of its proper divisors (17762109443).

51739739517 is a wasteful number, since it uses less digits than its factorization.

51739739517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120612.

The product of its digits is 6251175, while the sum is 57.

The spelling of 51739739517 in words is "fifty-one billion, seven hundred thirty-nine million, seven hundred thirty-nine thousand, five hundred seventeen".