2565122013 has 40 divisors (see below), whose sum is σ = 3874238016. Its totient is φ = 1691280000.

The previous prime is 2565122011. The next prime is 2565122023. The reversal of 2565122013 is 3102215652.

It is a happy number.

2565122013 is a `hidden beast` number, since 2 + 5 + 651 + 2 + 2 + 0 + 1 + 3 = 666.

It is not a de Polignac number, because 2565122013 - 2¹ = 2565122011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565122011) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4904370 + ... + 4904892.

Almost surely, 2^2565122013 is an apocalyptic number.

It is an amenable number.

2565122013 is a deficient number, since it is larger than the sum of its proper divisors (1309116003).

2565122013 is a wasteful number, since it uses less digits than its factorization.

2565122013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 2565122013 is about 50647.0336051382. The cubic root of 2565122013 is about 1368.8924952793.

Adding to 2565122013 its reverse (3102215652), we get a palindrome (5667337665).

The spelling of 2565122013 in words is "two billion, five hundred sixty-five million, one hundred twenty-two thousand, thirteen".