51330502251 has 128 divisors (see below), whose sum is σ = 91491840000. Its totient is φ = 27825638400.

The previous prime is 51330502199. The next prime is 51330502319. The reversal of 51330502251 is 15220503315.

It is a happy number.

51330502251 is a `hidden beast` number, since 5 + 133 + 0 + 502 + 25 + 1 = 666.

It is not a de Polignac number, because 51330502251 - 2⁷ = 51330502123 is a prime.

It is a super-2 number, since 2×51330502251² (a number of 22 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (51330502351) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 90211495 + ... + 90212063.

It is an arithmetic number, because the mean of its divisors is an integer number (714780000).

Almost surely, 2^51330502251 is an apocalyptic number.

51330502251 is a deficient number, since it is larger than the sum of its proper divisors (40161337749).

51330502251 is a wasteful number, since it uses less digits than its factorization.

51330502251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 51330502251 in words is "fifty-one billion, three hundred thirty million, five hundred two thousand, two hundred fifty-one".