2158204860889 has 27 divisors (see below), whose sum is σ = 2759691120501. Its totient is φ = 1681629928440.

The previous prime is 2158204860817. The next prime is 2158204860907. The reversal of 2158204860889 is 9880684028512.

The square root of 2158204860889 is 1469083.

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

It is not a de Polignac number, because 2158204860889 - 2¹¹ = 2158204858841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2158204861889) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 113109852 + ... + 113128930.

Almost surely, 2^{2158204860889} is an apocalyptic number.

2158204860889 is the 1469083-rd square number.

2158204860889 is the 734542-nd centered octagonal number.

It is an amenable number.

2158204860889 is a deficient number, since it is larger than the sum of its proper divisors (601486259612).

2158204860889 is an frugal number, since it uses more digits than its factorization.

2158204860889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38194 (or 19097 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 61.

The spelling of 2158204860889 in words is "two trillion, one hundred fifty-eight billion, two hundred four million, eight hundred sixty thousand, eight hundred eighty-nine".