660245731 has 2 divisors, whose sum is σ = 660245732. Its totient is φ = 660245730.

The previous prime is 660245717. The next prime is 660245743. The reversal of 660245731 is 137542066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660245731 - 2⁹ = 660245219 is a prime.

It is a super-2 number, since 2×660245731² = 871848850607448722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (660245771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330122865 + 330122866.

It is an arithmetic number, because the mean of its divisors is an integer number (330122866).

Almost surely, 2^660245731 is an apocalyptic number.

660245731 is a deficient number, since it is larger than the sum of its proper divisors (1).

660245731 is an equidigital number, since it uses as much as digits as its factorization.

660245731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 660245731 is about 25695.2472453565. The cubic root of 660245731 is about 870.7668101796.

Adding to 660245731 its reverse (137542066), we get a palindrome (797787797).

The spelling of 660245731 in words is "six hundred sixty million, two hundred forty-five thousand, seven hundred thirty-one".