2565131668 has 24 divisors (see below), whose sum is σ = 4898779200. Its totient is φ = 1165561920.

The previous prime is 2565131663. The next prime is 2565131669. The reversal of 2565131668 is 8661315652.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565131663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143305 + ... + 160207.

It is an arithmetic number, because the mean of its divisors is an integer number (204115800).

Almost surely, 2^2565131668 is an apocalyptic number.

It is an amenable number.

2565131668 is a deficient number, since it is larger than the sum of its proper divisors (2333647532).

2565131668 is a wasteful number, since it uses less digits than its factorization.

2565131668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20367 (or 20365 counting only the distinct ones).

The product of its digits is 259200, while the sum is 43.

The square root of 2565131668 is about 50647.1289215884. The cubic root of 2565131668 is about 1368.8942127597.

The spelling of 2565131668 in words is "two billion, five hundred sixty-five million, one hundred thirty-one thousand, six hundred sixty-eight".