660630531 has 32 divisors (see below), whose sum is σ = 982575360. Its totient is φ = 391414400.

The previous prime is 660630497. The next prime is 660630533. The reversal of 660630531 is 135036066.

It is a cyclic number.

It is not a de Polignac number, because 660630531 - 2¹⁴ = 660614147 is a prime.

It is a super-2 number, since 2×660630531² = 872865396978683922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (660630533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 679876 + ... + 680846.

It is an arithmetic number, because the mean of its divisors is an integer number (30705480).

Almost surely, 2^660630531 is an apocalyptic number.

660630531 is a deficient number, since it is larger than the sum of its proper divisors (321944829).

660630531 is a wasteful number, since it uses less digits than its factorization.

660630531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 660630531 is about 25702.7339207330. The cubic root of 660630531 is about 870.9359421554.

Adding to 660630531 its reverse (135036066), we get a palindrome (795666597).

The spelling of 660630531 in words is "six hundred sixty million, six hundred thirty thousand, five hundred thirty-one".