51510155202 has 160 divisors (see below), whose sum is σ = 129137976000. Its totient is φ = 15340786560.

The previous prime is 51510155197. The next prime is 51510155239. The reversal of 51510155202 is 20255101515.

51510155202 is a `hidden beast` number, since 5 + 1 + 5 + 101 + 552 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12719674 + ... + 12723722.

It is an arithmetic number, because the mean of its divisors is an integer number (807112350).

Almost surely, 2^51510155202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51510155202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64568988000).

51510155202 is an abundant number, since it is smaller than the sum of its proper divisors (77627820798).

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

51510155202 is a wasteful number, since it uses less digits than its factorization.

51510155202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155 (or 4124 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

Adding to 51510155202 its reverse (20255101515), we get a palindrome (71765256717).

The spelling of 51510155202 in words is "fifty-one billion, five hundred ten million, one hundred fifty-five thousand, two hundred two".