6651611231 has 2 divisors, whose sum is σ = 6651611232. Its totient is φ = 6651611230.

The previous prime is 6651611189. The next prime is 6651611279. The reversal of 6651611231 is 1321161566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6651611231 - 2²² = 6647416927 is a prime.

It is a super-2 number, since 2×6651611231² = 88487863936730670722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6651611831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325805615 + 3325805616.

It is an arithmetic number, because the mean of its divisors is an integer number (3325805616).

Almost surely, 2^6651611231 is an apocalyptic number.

6651611231 is a deficient number, since it is larger than the sum of its proper divisors (1).

6651611231 is an equidigital number, since it uses as much as digits as its factorization.

6651611231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 6651611231 is about 81557.4106442817. The cubic root of 6651611231 is about 1880.6542191777.

Adding to 6651611231 its reverse (1321161566), we get a palindrome (7972772797).

The spelling of 6651611231 in words is "six billion, six hundred fifty-one million, six hundred eleven thousand, two hundred thirty-one".