660616331 has 2 divisors, whose sum is σ = 660616332. Its totient is φ = 660616330.

The previous prime is 660616321. The next prime is 660616351. The reversal of 660616331 is 133616066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660616331 - 2¹⁸ = 660354187 is a prime.

It is a super-2 number, since 2×660616331² = 872827873567803122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (660616321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330308165 + 330308166.

It is an arithmetic number, because the mean of its divisors is an integer number (330308166).

Almost surely, 2^660616331 is an apocalyptic number.

660616331 is a deficient number, since it is larger than the sum of its proper divisors (1).

660616331 is an equidigital number, since it uses as much as digits as its factorization.

660616331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 660616331 is about 25702.4576840426. The cubic root of 660616331 is about 870.9297019659.

The spelling of 660616331 in words is "six hundred sixty million, six hundred sixteen thousand, three hundred thirty-one".