64521597193 has 2 divisors, whose sum is σ = 64521597194. Its totient is φ = 64521597192.

The previous prime is 64521597163. The next prime is 64521597199. The reversal of 64521597193 is 39179512546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59844815424 + 4676781769 = 244632^2 + 68387^2 .

It is a cyclic number.

It is not a de Polignac number, because 64521597193 - 2²¹ = 64519500041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64521597193.

It is not a weakly prime, because it can be changed into another prime (64521597199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32260798596 + 32260798597.

It is an arithmetic number, because the mean of its divisors is an integer number (32260798597).

Almost surely, 2^64521597193 is an apocalyptic number.

It is an amenable number.

64521597193 is a deficient number, since it is larger than the sum of its proper divisors (1).

64521597193 is an equidigital number, since it uses as much as digits as its factorization.

64521597193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The spelling of 64521597193 in words is "sixty-four billion, five hundred twenty-one million, five hundred ninety-seven thousand, one hundred ninety-three".