660873331 has 2 divisors, whose sum is σ = 660873332. Its totient is φ = 660873330.

The previous prime is 660873313. The next prime is 660873347. The reversal of 660873331 is 133378066.

Together with previous prime (660873313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660873331 - 2⁵ = 660873299 is a prime.

It is a super-2 number, since 2×660873331² = 873507119254071122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (660873361) 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, 330436665 + 330436666.

It is an arithmetic number, because the mean of its divisors is an integer number (330436666).

Almost surely, 2^660873331 is an apocalyptic number.

660873331 is a deficient number, since it is larger than the sum of its proper divisors (1).

660873331 is an equidigital number, since it uses as much as digits as its factorization.

660873331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 660873331 is about 25707.4567197924. The cubic root of 660873331 is about 871.0426267725.

The spelling of 660873331 in words is "six hundred sixty million, eight hundred seventy-three thousand, three hundred thirty-one".