2520086661 has 36 divisors (see below), whose sum is σ = 3801617664. Its totient is φ = 1670430600.

The previous prime is 2520086633. The next prime is 2520086663. The reversal of 2520086661 is 1666800252.

It is not a de Polignac number, because 2520086661 - 2⁷ = 2520086533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520086663) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1252146 + ... + 1254156.

Almost surely, 2^2520086661 is an apocalyptic number.

It is an amenable number.

2520086661 is a deficient number, since it is larger than the sum of its proper divisors (1281531003).

2520086661 is an frugal number, since it uses more digits than its factorization.

2520086661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226 (or 2205 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 2520086661 is about 50200.4647488447. The cubic root of 2520086661 is about 1360.8340222030.

The spelling of 2520086661 in words is "two billion, five hundred twenty million, eighty-six thousand, six hundred sixty-one".