2565233621 has 8 divisors (see below), whose sum is σ = 2620361664. Its totient is φ = 2510633440.

The previous prime is 2565233603. The next prime is 2565233639. The reversal of 2565233621 is 1263325652.

It is an interprime number because it is at equal distance from previous prime (2565233603) and next prime (2565233639).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2565233621 - 2⁶ = 2565233557 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 (2565233521) 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, 122135 + ... + 141588.

It is an arithmetic number, because the mean of its divisors is an integer number (327545208).

Almost surely, 2^2565233621 is an apocalyptic number.

It is an amenable number.

2565233621 is a deficient number, since it is larger than the sum of its proper divisors (55128043).

2565233621 is a wasteful number, since it uses less digits than its factorization.

2565233621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263931.

The product of its digits is 64800, while the sum is 35.

The square root of 2565233621 is about 50648.1354148403. The cubic root of 2565233621 is about 1368.9123484139.

The spelling of 2565233621 in words is "two billion, five hundred sixty-five million, two hundred thirty-three thousand, six hundred twenty-one".