663699031 has 2 divisors, whose sum is σ = 663699032. Its totient is φ = 663699030.

The previous prime is 663698957. The next prime is 663699037. The reversal of 663699031 is 130996366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663699031 - 2²³ = 655310423 is a prime.

It is a super-2 number, since 2×663699031² = 880992807500677922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663699037) 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, 331849515 + 331849516.

It is an arithmetic number, because the mean of its divisors is an integer number (331849516).

Almost surely, 2^663699031 is an apocalyptic number.

663699031 is a deficient number, since it is larger than the sum of its proper divisors (1).

663699031 is an equidigital number, since it uses as much as digits as its factorization.

663699031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 43.

The square root of 663699031 is about 25762.3568603496. The cubic root of 663699031 is about 872.2823023176.

The spelling of 663699031 in words is "six hundred sixty-three million, six hundred ninety-nine thousand, thirty-one".