2153345945 has 4 divisors (see below), whose sum is σ = 2584015140. Its totient is φ = 1722676752.

The previous prime is 2153345939. The next prime is 2153345989. The reversal of 2153345945 is 5495433512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1289456281 + 863889664 = 35909^2 + 29392^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153345945 - 2⁶ = 2153345881 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215334590 + ... + 215334599.

It is an arithmetic number, because the mean of its divisors is an integer number (646003785).

Almost surely, 2^2153345945 is an apocalyptic number.

It is an amenable number.

2153345945 is a deficient number, since it is larger than the sum of its proper divisors (430669195).

2153345945 is an equidigital number, since it uses as much as digits as its factorization.

2153345945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430669194.

The product of its digits is 324000, while the sum is 41.

The square root of 2153345945 is about 46404.1587037196. The cubic root of 2153345945 is about 1291.3320665232.

The spelling of 2153345945 in words is "two billion, one hundred fifty-three million, three hundred forty-five thousand, nine hundred forty-five".