660650531 has 2 divisors, whose sum is σ = 660650532. Its totient is φ = 660650530.

The previous prime is 660650521. The next prime is 660650561. The reversal of 660650531 is 135056066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660650531 - 2⁶ = 660650467 is a prime.

It is a super-2 number, since 2×660650531² = 872918248221163922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660650521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330325265 + 330325266.

It is an arithmetic number, because the mean of its divisors is an integer number (330325266).

Almost surely, 2^660650531 is an apocalyptic number.

660650531 is a deficient number, since it is larger than the sum of its proper divisors (1).

660650531 is an equidigital number, since it uses as much as digits as its factorization.

660650531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 660650531 is about 25703.1229814589. The cubic root of 660650531 is about 870.9447310029.

The spelling of 660650531 in words is "six hundred sixty million, six hundred fifty thousand, five hundred thirty-one".