660541499 has 2 divisors, whose sum is σ = 660541500. Its totient is φ = 660541498.

The previous prime is 660541493. The next prime is 660541513. The reversal of 660541499 is 994145066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660541499 - 2¹² = 660537403 is a prime.

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 (660541493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330270749 + 330270750.

It is an arithmetic number, because the mean of its divisors is an integer number (330270750).

Almost surely, 2^660541499 is an apocalyptic number.

660541499 is a deficient number, since it is larger than the sum of its proper divisors (1).

660541499 is an equidigital number, since it uses as much as digits as its factorization.

660541499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 660541499 is about 25701.0019065405. The cubic root of 660541499 is about 870.8968155691.

The spelling of 660541499 in words is "six hundred sixty million, five hundred forty-one thousand, four hundred ninety-nine".