265373661 has 12 divisors (see below), whose sum is σ = 411600192. Its totient is φ = 151642008.

The previous prime is 265373651. The next prime is 265373699. The reversal of 265373661 is 166373562.

It is not a de Polignac number, because 265373661 - 2¹⁰ = 265372637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265373651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 902485 + ... + 902778.

It is an arithmetic number, because the mean of its divisors is an integer number (34300016).

Almost surely, 2^265373661 is an apocalyptic number.

265373661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

265373661 is a deficient number, since it is larger than the sum of its proper divisors (146226531).

265373661 is a wasteful number, since it uses less digits than its factorization.

265373661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805280 (or 1805273 counting only the distinct ones).

The product of its digits is 136080, while the sum is 39.

The square root of 265373661 is about 16290.2934596035. The cubic root of 265373661 is about 642.6175843983.

Subtracting from 265373661 its reverse (166373562), we obtain a palindrome (99000099).

The spelling of 265373661 in words is "two hundred sixty-five million, three hundred seventy-three thousand, six hundred sixty-one".