265166640 has 60 divisors (see below), whose sum is σ = 890520384. Its totient is φ = 70710912.

The previous prime is 265166623. The next prime is 265166647. The reversal of 265166640 is 46661562.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 265166595 and 265166604.

It is not an unprimeable number, because it can be changed into a prime (265166647) 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, 183424 + ... + 184863.

Almost surely, 2^265166640 is an apocalyptic number.

265166640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265166640 is an abundant number, since it is smaller than the sum of its proper divisors (625353744).

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

265166640 is a wasteful number, since it uses less digits than its factorization.

265166640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368306 (or 368297 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 265166640 is about 16283.9380986296. The cubic root of 265166640 is about 642.4504365063.

The spelling of 265166640 in words is "two hundred sixty-five million, one hundred sixty-six thousand, six hundred forty".