901991010820 has 24 divisors (see below), whose sum is σ = 1955283740928. Its totient is φ = 349157810400.

The previous prime is 901991010803. The next prime is 901991010821. The reversal of 901991010820 is 28010199109.

It is not an unprimeable number, because it can be changed into a prime (901991010821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727411486 + ... + 727412725.

It is an arithmetic number, because the mean of its divisors is an integer number (81470155872).

Almost surely, 2^901991010820 is an apocalyptic number.

It is an amenable number.

901991010820 is an abundant number, since it is smaller than the sum of its proper divisors (1053292730108).

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

901991010820 is a wasteful number, since it uses less digits than its factorization.

901991010820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454824251 (or 1454824249 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 901991010820 in words is "nine hundred one billion, nine hundred ninety-one million, ten thousand, eight hundred twenty".