64664477173 has 2 divisors, whose sum is σ = 64664477174. Its totient is φ = 64664477172.

The previous prime is 64664477167. The next prime is 64664477191. The reversal of 64664477173 is 37177446646.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60980351364 + 3684125809 = 246942^2 + 60697^2 .

It is a cyclic number.

It is not a de Polignac number, because 64664477173 - 2³³ = 56074542581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64664477473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32332238586 + 32332238587.

It is an arithmetic number, because the mean of its divisors is an integer number (32332238587).

Almost surely, 2^64664477173 is an apocalyptic number.

It is an amenable number.

64664477173 is a deficient number, since it is larger than the sum of its proper divisors (1).

64664477173 is an equidigital number, since it uses as much as digits as its factorization.

64664477173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 55.

The spelling of 64664477173 in words is "sixty-four billion, six hundred sixty-four million, four hundred seventy-seven thousand, one hundred seventy-three".