2565203949 has 36 divisors (see below), whose sum is σ = 4702089600. Its totient is φ = 1332570960.

The previous prime is 2565203939. The next prime is 2565203951. The reversal of 2565203949 is 9493025652.

2565203949 is a `hidden beast` number, since 2 + 56 + 520 + 39 + 49 = 666.

It is not a de Polignac number, because 2565203949 - 2⁹ = 2565203437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565203939) 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, 259549 + ... + 269250.

It is an arithmetic number, because the mean of its divisors is an integer number (130613600).

Almost surely, 2^2565203949 is an apocalyptic number.

It is an amenable number.

2565203949 is a deficient number, since it is larger than the sum of its proper divisors (2136885651).

2565203949 is a wasteful number, since it uses less digits than its factorization.

2565203949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528830 (or 528820 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The square root of 2565203949 is about 50647.8424910677. The cubic root of 2565203949 is about 1368.9070703341.

The spelling of 2565203949 in words is "two billion, five hundred sixty-five million, two hundred three thousand, nine hundred forty-nine".