808958858621 has 16 divisors (see below), whose sum is σ = 858323709360. Its totient is φ = 759792337920.

The previous prime is 808958858597. The next prime is 808958858641. The reversal of 808958858621 is 126858859808.

It can be written as a sum of positive squares in 8 ways, for example, as 136115985721 + 672842872900 = 368939^2 + 820270^2 .

It is a cyclic number.

It is not a de Polignac number, because 808958858621 - 2¹⁸ = 808958596477 is a prime.

It is a super-3 number, since 3×808958858621³ (a number of 37 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808958858641) 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, 59488595 + ... + 59502191.

It is an arithmetic number, because the mean of its divisors is an integer number (53645231835).

Almost surely, 2^808958858621 is an apocalyptic number.

It is an amenable number.

808958858621 is a deficient number, since it is larger than the sum of its proper divisors (49364850739).

808958858621 is a wasteful number, since it uses less digits than its factorization.

808958858621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20624.

The product of its (nonzero) digits is 88473600, while the sum is 68.

The spelling of 808958858621 in words is "eight hundred eight billion, nine hundred fifty-eight million, eight hundred fifty-eight thousand, six hundred twenty-one".