2165100555 has 16 divisors (see below), whose sum is σ = 3482302464. Its totient is φ = 1148673120.

The previous prime is 2165100523. The next prime is 2165100563. The reversal of 2165100555 is 5550015612.

It is not a de Polignac number, because 2165100555 - 2⁵ = 2165100523 is a prime.

It is a super-2 number, since 2×2165100555² = 9375320826522616050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374989 + ... + 380718.

It is an arithmetic number, because the mean of its divisors is an integer number (217643904).

Almost surely, 2^2165100555 is an apocalyptic number.

2165100555 is a deficient number, since it is larger than the sum of its proper divisors (1317201909).

2165100555 is a wasteful number, since it uses less digits than its factorization.

2165100555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755906.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 2165100555 is about 46530.6410336243. The cubic root of 2165100555 is about 1293.6774968354.

The spelling of 2165100555 in words is "two billion, one hundred sixty-five million, one hundred thousand, five hundred fifty-five".