865054386889 has 81 divisors (see below), whose sum is σ = 1134533789319. Its totient is φ = 657159444480.

The previous prime is 865054386887. The next prime is 865054386919. The reversal of 865054386889 is 988683450568.

The square root of 865054386889 is 930083.

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., 851642894025 + 13411492864 = 922845^2 + 115808^2 .

It is not a de Polignac number, because 865054386889 - 2¹ = 865054386887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865054386881) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 3365970249 + ... + 3365970505.

Almost surely, 2^865054386889 is an apocalyptic number.

865054386889 is the 930083-rd square number.

865054386889 is the 465042-nd centered octagonal number.

It is an amenable number.

865054386889 is a deficient number, since it is larger than the sum of its proper divisors (269479402430).

865054386889 is an equidigital number, since it uses as much as digits as its factorization.

865054386889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 398131200, while the sum is 70.

The spelling of 865054386889 in words is "eight hundred sixty-five billion, fifty-four million, three hundred eighty-six thousand, eight hundred eighty-nine".