51515165016 has 96 divisors (see below), whose sum is σ = 161636086560. Its totient is φ = 14516983296.

The previous prime is 51515164997. The next prime is 51515165017. The reversal of 51515165016 is 61056151515.

It is a happy number.

51515165016 is a `hidden beast` number, since 51 + 51 + 51 + 6 + 501 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515165017) 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 23 ways as a sum of consecutive naturals, for example, 663295 + ... + 736878.

It is an arithmetic number, because the mean of its divisors is an integer number (1683709235).

Almost surely, 2^51515165016 is an apocalyptic number.

51515165016 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51515165016 is an abundant number, since it is smaller than the sum of its proper divisors (110120921544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51515165016 is a wasteful number, since it uses less digits than its factorization.

51515165016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400265 (or 1400258 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 51515165016 in words is "fifty-one billion, five hundred fifteen million, one hundred sixty-five thousand, sixteen".