808990587581 has 4 divisors (see below), whose sum is σ = 882535186464. Its totient is φ = 735445988700.

The previous prime is 808990587569. The next prime is 808990587599. The reversal of 808990587581 is 185785099808.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 808990587581 - 2³⁴ = 791810718397 is a prime.

It is a super-2 number, since 2×808990587581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808990587521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36772299425 + ... + 36772299446.

It is an arithmetic number, because the mean of its divisors is an integer number (220633796616).

Almost surely, 2^808990587581 is an apocalyptic number.

It is an amenable number.

808990587581 is a deficient number, since it is larger than the sum of its proper divisors (73544598883).

808990587581 is a wasteful number, since it uses less digits than its factorization.

808990587581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73544598882.

The product of its (nonzero) digits is 58060800, while the sum is 68.

The spelling of 808990587581 in words is "eight hundred eight billion, nine hundred ninety million, five hundred eighty-seven thousand, five hundred eighty-one".