51365421852 has 48 divisors (see below), whose sum is σ = 126351224832. Its totient is φ = 16216943040.

The previous prime is 51365421839. The next prime is 51365421857. The reversal of 51365421852 is 25812456315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51365421857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1451443 + ... + 1486410.

It is an arithmetic number, because the mean of its divisors is an integer number (2632317184).

Almost surely, 2^51365421852 is an apocalyptic number.

It is an amenable number.

51365421852 is an abundant number, since it is smaller than the sum of its proper divisors (74985802980).

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

51365421852 is a wasteful number, since it uses less digits than its factorization.

51365421852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2937938 (or 2937936 counting only the distinct ones).

The product of its digits is 288000, while the sum is 42.

The spelling of 51365421852 in words is "fifty-one billion, three hundred sixty-five million, four hundred twenty-one thousand, eight hundred fifty-two".