206664677 has 2 divisors, whose sum is σ = 206664678. Its totient is φ = 206664676.

The previous prime is 206664613. The next prime is 206664737. The reversal of 206664677 is 776466602.

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., 108139201 + 98525476 = 10399^2 + 9926^2 .

It is a cyclic number.

It is not a de Polignac number, because 206664677 - 2⁶ = 206664613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206664607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103332338 + 103332339.

It is an arithmetic number, because the mean of its divisors is an integer number (103332339).

Almost surely, 2^206664677 is an apocalyptic number.

It is an amenable number.

206664677 is a deficient number, since it is larger than the sum of its proper divisors (1).

206664677 is an equidigital number, since it uses as much as digits as its factorization.

206664677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 44.

The square root of 206664677 is about 14375.8365669619. The cubic root of 206664677 is about 591.2285775187.

The spelling of 206664677 in words is "two hundred six million, six hundred sixty-four thousand, six hundred seventy-seven".