6663531 has 16 divisors (see below), whose sum is σ = 10347264. Its totient is φ = 3735264.

The previous prime is 6663523. The next prime is 6663539. The reversal of 6663531 is 1353666.

It is an interprime number because it is at equal distance from previous prime (6663523) and next prime (6663539).

It is not a de Polignac number, because 6663531 - 2³ = 6663523 is a prime.

It is a super-2 number, since 2×6663531² = 88805290775922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6663539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1881 + ... + 4106.

It is an arithmetic number, because the mean of its divisors is an integer number (646704).

Almost surely, 2^6663531 is an apocalyptic number.

6663531 is a deficient number, since it is larger than the sum of its proper divisors (3683733).

6663531 is a wasteful number, since it uses less digits than its factorization.

6663531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6050.

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

The square root of 6663531 is about 2581.3816068145. The cubic root of 6663531 is about 188.1776933956.

It can be divided in two parts, 66635 and 31, that added together give a palindrome (66666).

The spelling of 6663531 in words is "six million, six hundred sixty-three thousand, five hundred thirty-one".