7666669 has 2 divisors, whose sum is σ = 7666670. Its totient is φ = 7666668.

The previous prime is 7666667. The next prime is 7666693. The reversal of 7666669 is 9666667.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7628644 + 38025 = 2762^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 7666669 - 2¹ = 7666667 is a prime.

It is a super-2 number, since 2×7666669² = 117555627111122, which contains 22 as substring.

Together with 7666667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7666661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3833334 + 3833335.

It is an arithmetic number, because the mean of its divisors is an integer number (3833335).

Almost surely, 2^7666669 is an apocalyptic number.

It is an amenable number.

7666669 is a deficient number, since it is larger than the sum of its proper divisors (1).

7666669 is an equidigital number, since it uses as much as digits as its factorization.

7666669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 7666669 is about 2768.8750423231. The cubic root of 7666669 is about 197.1827433274.

The spelling of 7666669 in words is "seven million, six hundred sixty-six thousand, six hundred sixty-nine".