660542539 has 2 divisors, whose sum is σ = 660542540. Its totient is φ = 660542538.

The previous prime is 660542503. The next prime is 660542563. The reversal of 660542539 is 935245066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660542539 - 2¹⁷ = 660411467 is a prime.

It is not a weakly prime, because it can be changed into another prime (660543539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330271269 + 330271270.

It is an arithmetic number, because the mean of its divisors is an integer number (330271270).

Almost surely, 2^660542539 is an apocalyptic number.

660542539 is a deficient number, since it is larger than the sum of its proper divisors (1).

660542539 is an equidigital number, since it uses as much as digits as its factorization.

660542539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 660542539 is about 25701.0221392068. The cubic root of 660542539 is about 870.8972726346.

The spelling of 660542539 in words is "six hundred sixty million, five hundred forty-two thousand, five hundred thirty-nine".