660490535 has 12 divisors (see below), whose sum is σ = 811460952. Its totient is φ = 516097008.

The previous prime is 660490531. The next prime is 660490541. The reversal of 660490535 is 535094066.

It is not a de Polignac number, because 660490535 - 2² = 660490531 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660490531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26477 + ... + 44966.

It is an arithmetic number, because the mean of its divisors is an integer number (67621746).

Almost surely, 2^660490535 is an apocalyptic number.

660490535 is a deficient number, since it is larger than the sum of its proper divisors (150970417).

660490535 is an equidigital number, since it uses as much as digits as its factorization.

660490535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71534 (or 71491 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 660490535 is about 25700.0104085582. The cubic root of 660490535 is about 870.8744170133.

The spelling of 660490535 in words is "six hundred sixty million, four hundred ninety thousand, five hundred thirty-five".