51806406820 has 24 divisors (see below), whose sum is σ = 124335376704. Its totient is φ = 17762196576.

The previous prime is 51806406811. The next prime is 51806406881. The reversal of 51806406820 is 2860460815.

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, 185022742 + ... + 185023021.

It is an arithmetic number, because the mean of its divisors is an integer number (5180640696).

Almost surely, 2^51806406820 is an apocalyptic number.

It is an amenable number.

51806406820 is an abundant number, since it is smaller than the sum of its proper divisors (72528969884).

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

51806406820 is a wasteful number, since it uses less digits than its factorization.

51806406820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370045779 (or 370045777 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 51806406820 in words is "fifty-one billion, eight hundred six million, four hundred six thousand, eight hundred twenty".