681364474573 has 2 divisors, whose sum is σ = 681364474574. Its totient is φ = 681364474572.

The previous prime is 681364474529. The next prime is 681364474589. The reversal of 681364474573 is 375474463186.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 679877755209 + 1486719364 = 824547^2 + 38558^2 .

It is a cyclic number.

It is not a de Polignac number, because 681364474573 - 2⁹ = 681364474061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681364484573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340682237286 + 340682237287.

It is an arithmetic number, because the mean of its divisors is an integer number (340682237287).

Almost surely, 2^681364474573 is an apocalyptic number.

It is an amenable number.

681364474573 is a deficient number, since it is larger than the sum of its proper divisors (1).

681364474573 is an equidigital number, since it uses as much as digits as its factorization.

681364474573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40642560, while the sum is 58.

The spelling of 681364474573 in words is "six hundred eighty-one billion, three hundred sixty-four million, four hundred seventy-four thousand, five hundred seventy-three".