866801402020 has 48 divisors (see below), whose sum is σ = 1862999284608. Its totient is φ = 338587441920.

The previous prime is 866801401979. The next prime is 866801402101. The reversal of 866801402020 is 20204108668.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4170160 + ... + 4373080.

It is an arithmetic number, because the mean of its divisors is an integer number (38812485096).

Almost surely, 2^866801402020 is an apocalyptic number.

It is an amenable number.

866801402020 is an abundant number, since it is smaller than the sum of its proper divisors (996197882588).

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

866801402020 is a wasteful number, since it uses less digits than its factorization.

866801402020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207940 (or 207938 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 866801402020 in words is "eight hundred sixty-six billion, eight hundred one million, four hundred two thousand, twenty".