858969361636 has 27 divisors (see below), whose sum is σ = 1596879652809. Its totient is φ = 404206047168.

The previous prime is 858969361597. The next prime is 858969361637. The reversal of 858969361636 is 636163969858.

It is a happy number.

The square root of 858969361636 is 926806.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 668747772900 + 190221588736 = 817770^2 + 436144^2 .

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858969361637) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31497775 + ... + 31525033.

Almost surely, 2^858969361636 is an apocalyptic number.

858969361636 is the 926806-th square number.

It is an amenable number.

858969361636 is a deficient number, since it is larger than the sum of its proper divisors (737910291173).

858969361636 is an frugal number, since it uses more digits than its factorization.

858969361636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54556 (or 27278 counting only the distinct ones).

The product of its digits is 302330880, while the sum is 70.

The spelling of 858969361636 in words is "eight hundred fifty-eight billion, nine hundred sixty-nine million, three hundred sixty-one thousand, six hundred thirty-six".