51011642420 has 12 divisors (see below), whose sum is σ = 107124449124. Its totient is φ = 20404656960.

The previous prime is 51011642401. The next prime is 51011642519. The reversal of 51011642420 is 2424611015.

It can be written as a sum of positive squares in 2 ways, for example, as 7103792656 + 43907849764 = 84284^2 + 209542^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51011642420.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1275291041 + ... + 1275291080.

It is an arithmetic number, because the mean of its divisors is an integer number (8927037427).

Almost surely, 2^51011642420 is an apocalyptic number.

It is an amenable number.

51011642420 is an abundant number, since it is smaller than the sum of its proper divisors (56112806704).

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

51011642420 is a wasteful number, since it uses less digits than its factorization.

51011642420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550582130 (or 2550582128 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 51011642420 in words is "fifty-one billion, eleven million, six hundred forty-two thousand, four hundred twenty".