51506514673919 has 16 divisors (see below), whose sum is σ = 52312511364960. Its totient is φ = 50701623667200.

The previous prime is 51506514673891. The next prime is 51506514673951. The reversal of 51506514673919 is 91937641560515.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51506514673919 is a prime.

It is a super-2 number, since 2×51506514673919² (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 (51506514673319) 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, 730667627 + ... + 730738115.

It is an arithmetic number, because the mean of its divisors is an integer number (3269531960310).

Almost surely, 2^{51506514673919} is an apocalyptic number.

51506514673919 is a deficient number, since it is larger than the sum of its proper divisors (805996691041).

51506514673919 is a wasteful number, since it uses less digits than its factorization.

51506514673919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78170.

The product of its (nonzero) digits is 30618000, while the sum is 62.

The spelling of 51506514673919 in words is "fifty-one trillion, five hundred six billion, five hundred fourteen million, six hundred seventy-three thousand, nine hundred nineteen".