2165220751 has 8 divisors (see below), whose sum is σ = 2192166144. Its totient is φ = 2138295960.

The previous prime is 2165220737. The next prime is 2165220787. The reversal of 2165220751 is 1570225612.

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 2165220751 - 2⁵ = 2165220719 is a prime.

It is a super-2 number, since 2×2165220751² = 9376361801122008002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165220721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411306 + ... + 416536.

It is an arithmetic number, because the mean of its divisors is an integer number (274020768).

Almost surely, 2^2165220751 is an apocalyptic number.

2165220751 is a deficient number, since it is larger than the sum of its proper divisors (26945393).

2165220751 is an equidigital number, since it uses as much as digits as its factorization.

2165220751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10301.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 2165220751 is about 46531.9325947247. The cubic root of 2165220751 is about 1293.7014359827.

The spelling of 2165220751 in words is "two billion, one hundred sixty-five million, two hundred twenty thousand, seven hundred fifty-one".