808495021761 has 16 divisors (see below), whose sum is σ = 1238375800704. Its totient is φ = 459603385344.

The previous prime is 808495021757. The next prime is 808495021769. The reversal of 808495021761 is 167120594808.

It is not a de Polignac number, because 808495021761 - 2² = 808495021757 is a prime.

It is a super-2 number, since 2×808495021761² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (808495021769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99736266 + ... + 99744371.

It is an arithmetic number, because the mean of its divisors is an integer number (77398487544).

Almost surely, 2^808495021761 is an apocalyptic number.

It is an amenable number.

808495021761 is a deficient number, since it is larger than the sum of its proper divisors (429880778943).

808495021761 is a wasteful number, since it uses less digits than its factorization.

808495021761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199480840.

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 808495021761 in words is "eight hundred eight billion, four hundred ninety-five million, twenty-one thousand, seven hundred sixty-one".