265665601 has 2 divisors, whose sum is σ = 265665602. Its totient is φ = 265665600.

The previous prime is 265665593. The next prime is 265665611. The reversal of 265665601 is 106566562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199487376 + 66178225 = 14124^2 + 8135^2 .

It is a cyclic number.

It is not a de Polignac number, because 265665601 - 2³ = 265665593 is a prime.

It is not a weakly prime, because it can be changed into another prime (265665611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132832800 + 132832801.

It is an arithmetic number, because the mean of its divisors is an integer number (132832801).

Almost surely, 2^265665601 is an apocalyptic number.

It is an amenable number.

265665601 is a deficient number, since it is larger than the sum of its proper divisors (1).

265665601 is an equidigital number, since it uses as much as digits as its factorization.

265665601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 265665601 is about 16299.2515472337. The cubic root of 265665601 is about 642.8531478717.

The spelling of 265665601 in words is "two hundred sixty-five million, six hundred sixty-five thousand, six hundred one".