663699061 has 2 divisors, whose sum is σ = 663699062. Its totient is φ = 663699060.

The previous prime is 663699053. The next prime is 663699073. The reversal of 663699061 is 160996366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 589566961 + 74132100 = 24281^2 + 8610^2 .

It is a cyclic number.

It is not a de Polignac number, because 663699061 - 2³ = 663699053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663699031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331849530 + 331849531.

It is an arithmetic number, because the mean of its divisors is an integer number (331849531).

Almost surely, 2^663699061 is an apocalyptic number.

It is an amenable number.

663699061 is a deficient number, since it is larger than the sum of its proper divisors (1).

663699061 is an equidigital number, since it uses as much as digits as its factorization.

663699061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 663699061 is about 25762.3574425944. The cubic root of 663699061 is about 872.2823154604.

The spelling of 663699061 in words is "six hundred sixty-three million, six hundred ninety-nine thousand, sixty-one".