858191020996 has 27 divisors (see below), whose sum is σ = 1506534130479. Its totient is φ = 427756882728.

The previous prime is 858191020991. The next prime is 858191021029. The reversal of 858191020996 is 699020191858.

The square root of 858191020996 is 926386.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 858191020996.

It is not an unprimeable number, because it can be changed into a prime (858191020991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 887477305 + ... + 887478271.

Almost surely, 2^858191020996 is an apocalyptic number.

858191020996 is the 926386-th square number.

It is an amenable number.

858191020996 is a deficient number, since it is larger than the sum of its proper divisors (648343109483).

858191020996 is an frugal number, since it uses more digits than its factorization.

858191020996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896 (or 1448 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 58.

The spelling of 858191020996 in words is "eight hundred fifty-eight billion, one hundred ninety-one million, twenty thousand, nine hundred ninety-six".