51081137874557 has 8 divisors (see below), whose sum is σ = 59081798024256. Its totient is φ = 43256316409632.

The previous prime is 51081137874517. The next prime is 51081137874583. The reversal of 51081137874557 is 75547873118015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51081137874557 - 2¹⁸ = 51081137612413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51081137874557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51081137874517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43959670568 + ... + 43959671729.

It is an arithmetic number, because the mean of its divisors is an integer number (7385224753032).

Almost surely, 2^{51081137874557} is an apocalyptic number.

It is an amenable number.

51081137874557 is a deficient number, since it is larger than the sum of its proper divisors (8000660149699).

51081137874557 is an equidigital number, since it uses as much as digits as its factorization.

51081137874557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87919342387.

The product of its (nonzero) digits is 32928000, while the sum is 62.

The spelling of 51081137874557 in words is "fifty-one trillion, eighty-one billion, one hundred thirty-seven million, eight hundred seventy-four thousand, five hundred fifty-seven".