2565870421687 has 16 divisors (see below), whose sum is σ = 2719311134400. Its totient is φ = 2416770415360.

The previous prime is 2565870421663. The next prime is 2565870421703. The reversal of 2565870421687 is 7861240785652.

It is a cyclic number.

It is not a de Polignac number, because 2565870421687 - 2²³ = 2565862033079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565870428687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15647718 + ... + 15810844.

It is an arithmetic number, because the mean of its divisors is an integer number (169956945900).

Almost surely, 2^{2565870421687} is an apocalyptic number.

2565870421687 is a deficient number, since it is larger than the sum of its proper divisors (153440712713).

2565870421687 is a wasteful number, since it uses less digits than its factorization.

2565870421687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176426.

The product of its (nonzero) digits is 45158400, while the sum is 61.

The spelling of 2565870421687 in words is "two trillion, five hundred sixty-five billion, eight hundred seventy million, four hundred twenty-one thousand, six hundred eighty-seven".