2565681738 has 32 divisors (see below), whose sum is σ = 5216762880. Its totient is φ = 841110000.

The previous prime is 2565681683. The next prime is 2565681743. The reversal of 2565681738 is 8371865652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74863 + ... + 103613.

It is an arithmetic number, because the mean of its divisors is an integer number (163023840).

Almost surely, 2^2565681738 is an apocalyptic number.

2565681738 is an abundant number, since it is smaller than the sum of its proper divisors (2651081142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2565681738 is a wasteful number, since it uses less digits than its factorization.

2565681738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29002.

The product of its digits is 2419200, while the sum is 51.

The square root of 2565681738 is about 50652.5590469030. The cubic root of 2565681738 is about 1368.9920548876.

The spelling of 2565681738 in words is "two billion, five hundred sixty-five million, six hundred eighty-one thousand, seven hundred thirty-eight".