660883531 has 24 divisors (see below), whose sum is σ = 843150384. Its totient is φ = 512225280.

The previous prime is 660883519. The next prime is 660883589. The reversal of 660883531 is 135388066.

It is a de Polignac number, because none of the positive numbers 2^k-660883531 is a prime.

It is a super-2 number, since 2×660883531² = 873534083094055922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660883231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100851 + ... + 107203.

It is an arithmetic number, because the mean of its divisors is an integer number (35131266).

Almost surely, 2^660883531 is an apocalyptic number.

660883531 is a deficient number, since it is larger than the sum of its proper divisors (182266853).

660883531 is a wasteful number, since it uses less digits than its factorization.

660883531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6571 (or 6564 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 660883531 is about 25707.6551050460. The cubic root of 660883531 is about 871.0471080090.

The spelling of 660883531 in words is "six hundred sixty million, eight hundred eighty-three thousand, five hundred thirty-one".