64660447 has 2 divisors, whose sum is σ = 64660448. Its totient is φ = 64660446.

The previous prime is 64660441. The next prime is 64660457. The reversal of 64660447 is 74406646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64660447 - 2⁷ = 64660319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64660441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32330223 + 32330224.

It is an arithmetic number, because the mean of its divisors is an integer number (32330224).

Almost surely, 2^64660447 is an apocalyptic number.

64660447 is a deficient number, since it is larger than the sum of its proper divisors (1).

64660447 is an equidigital number, since it uses as much as digits as its factorization.

64660447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 64660447 is about 8041.1719916937. The cubic root of 64660447 is about 401.3712252320.

The spelling of 64660447 in words is "sixty-four million, six hundred sixty thousand, four hundred forty-seven".