6658631 has 16 divisors (see below), whose sum is σ = 7996416. Its totient is φ = 5425056.

The previous prime is 6658609. The next prime is 6658637. The reversal of 6658631 is 1368566.

It is a de Polignac number, because none of the positive numbers 2^k-6658631 is a prime.

It is a super-2 number, since 2×6658631² = 88674733588322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6658591 and 6658600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6658637) 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, 11900 + ... + 12446.

It is an arithmetic number, because the mean of its divisors is an integer number (499776).

Almost surely, 2^6658631 is an apocalyptic number.

6658631 is a deficient number, since it is larger than the sum of its proper divisors (1337785).

6658631 is a wasteful number, since it uses less digits than its factorization.

6658631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638.

The product of its digits is 25920, while the sum is 35.

The square root of 6658631 is about 2580.4323281187. The cubic root of 6658631 is about 188.1315568551.

The spelling of 6658631 in words is "six million, six hundred fifty-eight thousand, six hundred thirty-one".