51245263872 has 176 divisors, whose sum is σ = 165561360000. Its totient is φ = 15528775680.

The previous prime is 51245263843. The next prime is 51245263957. The reversal of 51245263872 is 27836254215.

51245263872 is a `hidden beast` number, since 5 + 1 + 2 + 4 + 5 + 2 + 638 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (176).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219879 + ... + 388377.

Almost surely, 2^51245263872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51245263872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82780680000).

51245263872 is an abundant number, since it is smaller than the sum of its proper divisors (114316096128).

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

51245263872 is a wasteful number, since it uses less digits than its factorization.

51245263872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168539 (or 168515 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 51245263872 in words is "fifty-one billion, two hundred forty-five million, two hundred sixty-three thousand, eight hundred seventy-two".