51761680736431 has 4 divisors (see below), whose sum is σ = 51761712054664. Its totient is φ = 51761649418200.

The previous prime is 51761680736407. The next prime is 51761680736533. The reversal of 51761680736431 is 13463708616715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51761680736431 - 2¹³ = 51761680728239 is a prime.

It is a super-2 number, since 2×51761680736431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51761680734431) 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, 13033185 + ... + 16534426.

It is an arithmetic number, because the mean of its divisors is an integer number (12940428013666).

Almost surely, 2^{51761680736431} is an apocalyptic number.

51761680736431 is a deficient number, since it is larger than the sum of its proper divisors (31318233).

51761680736431 is a wasteful number, since it uses less digits than its factorization.

51761680736431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31318232.

The product of its (nonzero) digits is 15240960, while the sum is 58.

The spelling of 51761680736431 in words is "fifty-one trillion, seven hundred sixty-one billion, six hundred eighty million, seven hundred thirty-six thousand, four hundred thirty-one".