7666547635181 has 2 divisors, whose sum is σ = 7666547635182. Its totient is φ = 7666547635180.

The previous prime is 7666547635163. The next prime is 7666547635183. The reversal of 7666547635181 is 1815367456667.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6387578897956 + 1278968737225 = 2527366^2 + 1130915^2 .

It is a cyclic number.

It is not a de Polignac number, because 7666547635181 - 2²⁶ = 7666480526317 is a prime.

It is a super-2 number, since 2×7666547635181² (a number of 27 digits) contains 22 as substring.

Together with 7666547635183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7666547635183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3833273817590 + 3833273817591.

It is an arithmetic number, because the mean of its divisors is an integer number (3833273817591).

Almost surely, 2^{7666547635181} is an apocalyptic number.

It is an amenable number.

7666547635181 is a deficient number, since it is larger than the sum of its proper divisors (1).

7666547635181 is an equidigital number, since it uses as much as digits as its factorization.

7666547635181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 152409600, while the sum is 65.

The spelling of 7666547635181 in words is "seven trillion, six hundred sixty-six billion, five hundred forty-seven million, six hundred thirty-five thousand, one hundred eighty-one".