265861660 has 12 divisors (see below), whose sum is σ = 558309528. Its totient is φ = 106344656.

The previous prime is 265861637. The next prime is 265861663. The reversal of 265861660 is 66168562.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265861663) 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, 6646522 + ... + 6646561.

It is an arithmetic number, because the mean of its divisors is an integer number (46525794).

Almost surely, 2^265861660 is an apocalyptic number.

265861660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265861660 is an abundant number, since it is smaller than the sum of its proper divisors (292447868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265861660 is a wasteful number, since it uses less digits than its factorization.

265861660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13293092 (or 13293090 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 265861660 is about 16305.2647939247. The cubic root of 265861660 is about 643.0112490746.

The spelling of 265861660 in words is "two hundred sixty-five million, eight hundred sixty-one thousand, six hundred sixty".