64678640633 has 2 divisors, whose sum is σ = 64678640634. Its totient is φ = 64678640632.

The previous prime is 64678640569. The next prime is 64678640651. The reversal of 64678640633 is 33604687646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41242704889 + 23435935744 = 203083^2 + 153088^2 .

It is a cyclic number.

It is not a de Polignac number, because 64678640633 - 2⁶ = 64678640569 is a prime.

It is not a weakly prime, because it can be changed into another prime (64677640633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32339320316 + 32339320317.

It is an arithmetic number, because the mean of its divisors is an integer number (32339320317).

Almost surely, 2^64678640633 is an apocalyptic number.

It is an amenable number.

64678640633 is a deficient number, since it is larger than the sum of its proper divisors (1).

64678640633 is an equidigital number, since it uses as much as digits as its factorization.

64678640633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 53.

The spelling of 64678640633 in words is "sixty-four billion, six hundred seventy-eight million, six hundred forty thousand, six hundred thirty-three".