660381607 has 2 divisors, whose sum is σ = 660381608. Its totient is φ = 660381606.

The previous prime is 660381593. The next prime is 660381641. The reversal of 660381607 is 706183066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660381607 - 2⁷ = 660381479 is a prime.

It is a super-2 number, since 2×660381607² = 872207733727804898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660381647) 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, 330190803 + 330190804.

It is an arithmetic number, because the mean of its divisors is an integer number (330190804).

Almost surely, 2^660381607 is an apocalyptic number.

660381607 is a deficient number, since it is larger than the sum of its proper divisors (1).

660381607 is an equidigital number, since it uses as much as digits as its factorization.

660381607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 660381607 is about 25697.8911002440. The cubic root of 660381607 is about 870.8265395551.

The spelling of 660381607 in words is "six hundred sixty million, three hundred eighty-one thousand, six hundred seven".