2165297670 has 56 divisors (see below), whose sum is σ = 5843650176. Its totient is φ = 577410768.

The previous prime is 2165297657. The next prime is 2165297711. The reversal of 2165297670 is 767925612.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 141222 + ... + 155801.

It is an arithmetic number, because the mean of its divisors is an integer number (104350896).

Almost surely, 2^2165297670 is an apocalyptic number.

2165297670 is an abundant number, since it is smaller than the sum of its proper divisors (3678352506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2165297670 is an equidigital number, since it uses as much as digits as its factorization.

2165297670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297048 (or 297033 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 2165297670 is about 46532.7591058171. The cubic root of 2165297670 is about 1293.7167552894.

The spelling of 2165297670 in words is "two billion, one hundred sixty-five million, two hundred ninety-seven thousand, six hundred seventy".