655904008591 has 16 divisors (see below), whose sum is σ = 721696808448. Its totient is φ = 592406380800.

The previous prime is 655904008583. The next prime is 655904008601. The reversal of 655904008591 is 195800409556.

It is not a de Polignac number, because 655904008591 - 2³ = 655904008583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655904008531) 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, 2013766 + ... + 2316691.

It is an arithmetic number, because the mean of its divisors is an integer number (45106050528).

Almost surely, 2^655904008591 is an apocalyptic number.

655904008591 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

655904008591 is a deficient number, since it is larger than the sum of its proper divisors (65792799857).

655904008591 is a wasteful number, since it uses less digits than its factorization.

655904008591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330722.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 655904008591 in words is "six hundred fifty-five billion, nine hundred four million, eight thousand, five hundred ninety-one".