2521164545 has 4 divisors (see below), whose sum is σ = 3025397460. Its totient is φ = 2016931632.

The previous prime is 2521164493. The next prime is 2521164563. The reversal of 2521164545 is 5454611252.

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 859134721 + 1662029824 = 29311^2 + 40768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521164545 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, 252116450 + ... + 252116459.

It is an arithmetic number, because the mean of its divisors is an integer number (756349365).

Almost surely, 2^2521164545 is an apocalyptic number.

It is an amenable number.

2521164545 is a deficient number, since it is larger than the sum of its proper divisors (504232915).

2521164545 is an equidigital number, since it uses as much as digits as its factorization.

2521164545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504232914.

The product of its digits is 48000, while the sum is 35.

The square root of 2521164545 is about 50211.1993981422. The cubic root of 2521164545 is about 1361.0280118468.

Adding to 2521164545 its reverse (5454611252), we get a palindrome (7975775797).

The spelling of 2521164545 in words is "two billion, five hundred twenty-one million, one hundred sixty-four thousand, five hundred forty-five".