64920904193 has 2 divisors, whose sum is σ = 64920904194. Its totient is φ = 64920904192.

The previous prime is 64920904177. The next prime is 64920904199. The reversal of 64920904193 is 39140902946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64621198849 + 299705344 = 254207^2 + 17312^2 .

It is a cyclic number.

It is not a de Polignac number, because 64920904193 - 2⁴ = 64920904177 is a prime.

It is not a weakly prime, because it can be changed into another prime (64920904199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32460452096 + 32460452097.

It is an arithmetic number, because the mean of its divisors is an integer number (32460452097).

Almost surely, 2^64920904193 is an apocalyptic number.

It is an amenable number.

64920904193 is a deficient number, since it is larger than the sum of its proper divisors (1).

64920904193 is an equidigital number, since it uses as much as digits as its factorization.

64920904193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 64920904193 in words is "sixty-four billion, nine hundred twenty million, nine hundred four thousand, one hundred ninety-three".