858900779361 has 9 divisors (see below), whose sum is σ = 1240638475089. Its totient is φ = 572598666036.

The previous prime is 858900779351. The next prime is 858900779383. The reversal of 858900779361 is 163977009858.

The square root of 858900779361 is 926769.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 858900779361 - 2⁹ = 858900778849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (858900779351) 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 8 ways as a sum of consecutive naturals, for example, 2625846 + ... + 2934768.

Almost surely, 2^858900779361 is an apocalyptic number.

858900779361 is the 926769-th square number.

858900779361 is the 463385-th centered octagonal number.

It is an amenable number.

858900779361 is a deficient number, since it is larger than the sum of its proper divisors (381737695728).

858900779361 is an frugal number, since it uses more digits than its factorization.

858900779361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617852 (or 308926 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 858900779361 in words is "eight hundred fifty-eight billion, nine hundred million, seven hundred seventy-nine thousand, three hundred sixty-one".