667830869 has 2 divisors, whose sum is σ = 667830870. Its totient is φ = 667830868.

The previous prime is 667830857. The next prime is 667830883. The reversal of 667830869 is 968038766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659821969 + 8008900 = 25687^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 667830869 - 2¹² = 667826773 is a prime.

It is a super-2 number, since 2×667830869² = 891996139178590322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667830869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667830809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333915434 + 333915435.

It is an arithmetic number, because the mean of its divisors is an integer number (333915435).

Almost surely, 2^667830869 is an apocalyptic number.

It is an amenable number.

667830869 is a deficient number, since it is larger than the sum of its proper divisors (1).

667830869 is an equidigital number, since it uses as much as digits as its factorization.

667830869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The square root of 667830869 is about 25842.4238220798. The cubic root of 667830869 is about 874.0886812253.

The spelling of 667830869 in words is "six hundred sixty-seven million, eight hundred thirty thousand, eight hundred sixty-nine".