265624643 has 4 divisors (see below), whose sum is σ = 281249640. Its totient is φ = 249999648.

The previous prime is 265624627. The next prime is 265624669. The reversal of 265624643 is 346426562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 265624643 - 2⁴ = 265624627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 265624597 and 265624606.

It is not an unprimeable number, because it can be changed into a prime (265624673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7812473 + ... + 7812506.

It is an arithmetic number, because the mean of its divisors is an integer number (70312410).

Almost surely, 2^265624643 is an apocalyptic number.

265624643 is a deficient number, since it is larger than the sum of its proper divisors (15624997).

265624643 is a wasteful number, since it uses less digits than its factorization.

265624643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15624996.

The product of its digits is 207360, while the sum is 38.

The square root of 265624643 is about 16297.9950607429. The cubic root of 265624643 is about 642.8201096809.

The spelling of 265624643 in words is "two hundred sixty-five million, six hundred twenty-four thousand, six hundred forty-three".