51990006519 has 32 divisors (see below), whose sum is σ = 84045427200. Its totient is φ = 31501154880.

The previous prime is 51990006511. The next prime is 51990006547. The reversal of 51990006519 is 91560009915.

It is a happy number.

It is not a de Polignac number, because 51990006519 - 2³ = 51990006511 is a prime.

It is a super-2 number, since 2×51990006519² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51990006511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1289622 + ... + 1329324.

It is an arithmetic number, because the mean of its divisors is an integer number (2626419600).

Almost surely, 2^51990006519 is an apocalyptic number.

51990006519 is a deficient number, since it is larger than the sum of its proper divisors (32055420681).

51990006519 is a wasteful number, since it uses less digits than its factorization.

51990006519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44132 (or 44126 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 45.

The spelling of 51990006519 in words is "fifty-one billion, nine hundred ninety million, six thousand, five hundred nineteen".