64845261 has 12 divisors (see below), whose sum is σ = 100870588. Its totient is φ = 39904704.

The previous prime is 64845229. The next prime is 64845269. The reversal of 64845261 is 16254846.

64845261 is a `hidden beast` number, since 648 + 4 + 5 + 2 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 43639236 = 4605^2 + 6606^2 .

It is not a de Polignac number, because 64845261 - 2⁵ = 64845229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64845269) 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, 277000 + ... + 277233.

Almost surely, 2^64845261 is an apocalyptic number.

It is an amenable number.

64845261 is a deficient number, since it is larger than the sum of its proper divisors (36025327).

64845261 is a wasteful number, since it uses less digits than its factorization.

64845261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554252 (or 554249 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 64845261 is about 8052.6555247322. The cubic root of 64845261 is about 401.7532643490.

The spelling of 64845261 in words is "sixty-four million, eight hundred forty-five thousand, two hundred sixty-one".