265221651 has 4 divisors (see below), whose sum is σ = 353628872. Its totient is φ = 176814432.

The previous prime is 265221637. The next prime is 265221659. The reversal of 265221651 is 156122562.

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

It is not a de Polignac number, because 265221651 - 2¹⁵ = 265188883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265221659) 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, 44203606 + ... + 44203611.

It is an arithmetic number, because the mean of its divisors is an integer number (88407218).

Almost surely, 2^265221651 is an apocalyptic number.

265221651 is a deficient number, since it is larger than the sum of its proper divisors (88407221).

265221651 is an equidigital number, since it uses as much as digits as its factorization.

265221651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88407220.

The product of its digits is 7200, while the sum is 30.

The square root of 265221651 is about 16285.6271294660. The cubic root of 265221651 is about 642.4948606431.

The spelling of 265221651 in words is "two hundred sixty-five million, two hundred twenty-one thousand, six hundred fifty-one".