660117331 has 2 divisors, whose sum is σ = 660117332. Its totient is φ = 660117330.

The previous prime is 660117329. The next prime is 660117373. The reversal of 660117331 is 133711066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660117331 - 2¹ = 660117329 is a prime.

It is a super-2 number, since 2×660117331² = 871509781373127122, which contains 22 as substring.

Together with 660117329, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 660117331.

It is not a weakly prime, because it can be changed into another prime (660117431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330058665 + 330058666.

It is an arithmetic number, because the mean of its divisors is an integer number (330058666).

Almost surely, 2^660117331 is an apocalyptic number.

660117331 is a deficient number, since it is larger than the sum of its proper divisors (1).

660117331 is an equidigital number, since it uses as much as digits as its factorization.

660117331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 660117331 is about 25692.7486073406. The cubic root of 660117331 is about 870.7103596280.

Adding to 660117331 its reverse (133711066), we get a palindrome (793828397).

It can be divided in two parts, 6601 and 17331, that added together give a palindrome (23932).

The spelling of 660117331 in words is "six hundred sixty million, one hundred seventeen thousand, three hundred thirty-one".