2165570551 has 8 divisors (see below), whose sum is σ = 2307564720. Its totient is φ = 2025199488.

The previous prime is 2165570527. The next prime is 2165570557. The reversal of 2165570551 is 1550755612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2165570551 - 2⁷ = 2165570423 is a prime.

It is a super-2 number, since 2×2165570551² = 9379391622716887202, which contains 22 as substring.

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 2165570551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165570557) 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 7 ways as a sum of consecutive naturals, for example, 403021 + ... + 408358.

It is an arithmetic number, because the mean of its divisors is an integer number (288445590).

Almost surely, 2^2165570551 is an apocalyptic number.

2165570551 is a deficient number, since it is larger than the sum of its proper divisors (141994169).

2165570551 is a wasteful number, since it uses less digits than its factorization.

2165570551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811553.

The product of its (nonzero) digits is 52500, while the sum is 37.

The square root of 2165570551 is about 46535.6911520609. The cubic root of 2165570551 is about 1293.7710997640.

The spelling of 2165570551 in words is "two billion, one hundred sixty-five million, five hundred seventy thousand, five hundred fifty-one".