2521948865585 has 4 divisors (see below), whose sum is σ = 3026338638708. Its totient is φ = 2017559092464.

The previous prime is 2521948865551. The next prime is 2521948865609. The reversal of 2521948865585 is 5855688491252.

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 1145721907456 + 1376226958129 = 1070384^2 + 1173127^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521948865585 - 2⁸ = 2521948865329 is a prime.

It is a Duffinian number.

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, 252194886554 + ... + 252194886563.

It is an arithmetic number, because the mean of its divisors is an integer number (756584659677).

Almost surely, 2^{2521948865585} is an apocalyptic number.

It is an amenable number.

2521948865585 is a deficient number, since it is larger than the sum of its proper divisors (504389773123).

2521948865585 is an equidigital number, since it uses as much as digits as its factorization.

2521948865585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504389773122.

The product of its digits is 276480000, while the sum is 68.

The spelling of 2521948865585 in words is "two trillion, five hundred twenty-one billion, nine hundred forty-eight million, eight hundred sixty-five thousand, five hundred eighty-five".