51805736520 has 32 divisors (see below), whose sum is σ = 155417209920. Its totient is φ = 13814863040.

The previous prime is 51805736501. The next prime is 51805736533. The reversal of 51805736520 is 2563750815.

51805736520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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, 215857116 + ... + 215857355.

It is an arithmetic number, because the mean of its divisors is an integer number (4856787810).

Almost surely, 2^51805736520 is an apocalyptic number.

It is an amenable number.

51805736520 is an abundant number, since it is smaller than the sum of its proper divisors (103611473400).

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

51805736520 is a wasteful number, since it uses less digits than its factorization.

51805736520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431714485 (or 431714481 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 51805736520 in words is "fifty-one billion, eight hundred five million, seven hundred thirty-six thousand, five hundred twenty".