51251423120 has 40 divisors (see below), whose sum is σ = 119178086400. Its totient is φ = 20497381760.

The previous prime is 51251423107. The next prime is 51251423131. The reversal of 51251423120 is 2132415215.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 51251423120.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506531 + ... + 599229.

It is an arithmetic number, because the mean of its divisors is an integer number (2979452160).

Almost surely, 2^51251423120 is an apocalyptic number.

It is an amenable number.

51251423120 is an abundant number, since it is smaller than the sum of its proper divisors (67926663280).

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

51251423120 is a wasteful number, since it uses less digits than its factorization.

51251423120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99623 (or 99617 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 51251423120 its reverse (2132415215), we get a palindrome (53383838335).

The spelling of 51251423120 in words is "fifty-one billion, two hundred fifty-one million, four hundred twenty-three thousand, one hundred twenty".