663699073 has 2 divisors, whose sum is σ = 663699074. Its totient is φ = 663699072.

The previous prime is 663699061. The next prime is 663699097. The reversal of 663699073 is 370996366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602358849 + 61340224 = 24543^2 + 7832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663699073 is a prime.

It is not a weakly prime, because it can be changed into another prime (663699053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331849536 + 331849537.

It is an arithmetic number, because the mean of its divisors is an integer number (331849537).

Almost surely, 2^663699073 is an apocalyptic number.

It is an amenable number.

663699073 is a deficient number, since it is larger than the sum of its proper divisors (1).

663699073 is an equidigital number, since it uses as much as digits as its factorization.

663699073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 49.

The square root of 663699073 is about 25762.3576754924. The cubic root of 663699073 is about 872.2823207174.

The spelling of 663699073 in words is "six hundred sixty-three million, six hundred ninety-nine thousand, seventy-three".