7664666231 has 2 divisors, whose sum is σ = 7664666232. Its totient is φ = 7664666230.

The previous prime is 7664666213. The next prime is 7664666249. The reversal of 7664666231 is 1326664667.

Together with previous prime (7664666213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (7664666213) and next prime (7664666249).

It is an emirp because it is prime and its reverse (1326664667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7664666231 - 2⁶ = 7664666167 is a prime.

It is a super-2 number, since 2×7664666231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7664666131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832333115 + 3832333116.

It is an arithmetic number, because the mean of its divisors is an integer number (3832333116).

Almost surely, 2^7664666231 is an apocalyptic number.

7664666231 is a deficient number, since it is larger than the sum of its proper divisors (1).

7664666231 is an equidigital number, since it uses as much as digits as its factorization.

7664666231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 47.

The square root of 7664666231 is about 87548.0795391881. The cubic root of 7664666231 is about 1971.6557177270.

The spelling of 7664666231 in words is "seven billion, six hundred sixty-four million, six hundred sixty-six thousand, two hundred thirty-one".