808019521820 has 48 divisors (see below), whose sum is σ = 1939303627968. Its totient is φ = 277027153920.

The previous prime is 808019521787. The next prime is 808019521889. The reversal of 808019521820 is 28125910808.

808019521820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×808019521820² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6592214 + ... + 6713666.

It is an arithmetic number, because the mean of its divisors is an integer number (40402158916).

Almost surely, 2^808019521820 is an apocalyptic number.

It is an amenable number.

808019521820 is an abundant number, since it is smaller than the sum of its proper divisors (1131284106148).

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

808019521820 is a wasteful number, since it uses less digits than its factorization.

808019521820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168990 (or 168988 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 44.

The spelling of 808019521820 in words is "eight hundred eight billion, nineteen million, five hundred twenty-one thousand, eight hundred twenty".