668072231 has 2 divisors, whose sum is σ = 668072232. Its totient is φ = 668072230.

The previous prime is 668072219. The next prime is 668072287. The reversal of 668072231 is 132270866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668072231 - 2¹⁴ = 668055847 is a prime.

It is a super-2 number, since 2×668072231² = 892641011666634722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 668072191 and 668072200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668072291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334036115 + 334036116.

It is an arithmetic number, because the mean of its divisors is an integer number (334036116).

Almost surely, 2^668072231 is an apocalyptic number.

668072231 is a deficient number, since it is larger than the sum of its proper divisors (1).

668072231 is an equidigital number, since it uses as much as digits as its factorization.

668072231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 668072231 is about 25847.0932795160. The cubic root of 668072231 is about 874.1939705489.

The spelling of 668072231 in words is "six hundred sixty-eight million, seventy-two thousand, two hundred thirty-one".