51660011519 has 4 divisors (see below), whose sum is σ = 54698835744. Its totient is φ = 48621187296.

The previous prime is 51660011489. The next prime is 51660011551. The reversal of 51660011519 is 91511006615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51660011519 is a prime.

It is a super-2 number, since 2×51660011519² (a number of 22 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 (51660011219) 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, 1519412087 + ... + 1519412120.

It is an arithmetic number, because the mean of its divisors is an integer number (13674708936).

Almost surely, 2^51660011519 is an apocalyptic number.

51660011519 is a deficient number, since it is larger than the sum of its proper divisors (3038824225).

51660011519 is a wasteful number, since it uses less digits than its factorization.

51660011519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3038824224.

The product of its (nonzero) digits is 8100, while the sum is 35.

The spelling of 51660011519 in words is "fifty-one billion, six hundred sixty million, eleven thousand, five hundred nineteen".