2521660243 has 8 divisors (see below), whose sum is σ = 2558239200. Its totient is φ = 2485136448.

The previous prime is 2521660241. The next prime is 2521660247. The reversal of 2521660243 is 3420661252.

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 2521660243 - 2¹ = 2521660241 is a prime.

It is a super-2 number, since 2×2521660243² = 12717540762253638098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521660241) 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, 83193 + ... + 109381.

It is an arithmetic number, because the mean of its divisors is an integer number (319779900).

Almost surely, 2^2521660243 is an apocalyptic number.

2521660243 is a deficient number, since it is larger than the sum of its proper divisors (36578957).

2521660243 is a wasteful number, since it uses less digits than its factorization.

2521660243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27581.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 2521660243 is about 50216.1352853841. The cubic root of 2521660243 is about 1361.1172053710.

The spelling of 2521660243 in words is "two billion, five hundred twenty-one million, six hundred sixty thousand, two hundred forty-three".