64660466639 has 2 divisors, whose sum is σ = 64660466640. Its totient is φ = 64660466638.

The previous prime is 64660466581. The next prime is 64660466681. The reversal of 64660466639 is 93666406646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64660466639 - 2⁸ = 64660466383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64660466699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32330233319 + 32330233320.

It is an arithmetic number, because the mean of its divisors is an integer number (32330233320).

Almost surely, 2^64660466639 is an apocalyptic number.

64660466639 is a deficient number, since it is larger than the sum of its proper divisors (1).

64660466639 is an equidigital number, since it uses as much as digits as its factorization.

64660466639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20155392, while the sum is 56.

The spelling of 64660466639 in words is "sixty-four billion, six hundred sixty million, four hundred sixty-six thousand, six hundred thirty-nine".