666932869 has 2 divisors, whose sum is σ = 666932870. Its totient is φ = 666932868.

The previous prime is 666932843. The next prime is 666932911. The reversal of 666932869 is 968239666.

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., 504676225 + 162256644 = 22465^2 + 12738^2 .

It is a cyclic number.

It is not a de Polignac number, because 666932869 - 2¹³ = 666924677 is a prime.

It is a super-2 number, since 2×666932869² = 889598903505142322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666932839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333466434 + 333466435.

It is an arithmetic number, because the mean of its divisors is an integer number (333466435).

Almost surely, 2^666932869 is an apocalyptic number.

It is an amenable number.

666932869 is a deficient number, since it is larger than the sum of its proper divisors (1).

666932869 is an equidigital number, since it uses as much as digits as its factorization.

666932869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 55.

The square root of 666932869 is about 25825.0434462364. The cubic root of 666932869 is about 873.6967238425.

The spelling of 666932869 in words is "six hundred sixty-six million, nine hundred thirty-two thousand, eight hundred sixty-nine".