186664997 has 2 divisors, whose sum is σ = 186664998. Its totient is φ = 186664996.

The previous prime is 186664991. The next prime is 186665027. The reversal of 186664997 is 799466681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159112996 + 27552001 = 12614^2 + 5249^2 .

It is a cyclic number.

It is not a de Polignac number, because 186664997 - 2¹⁰ = 186663973 is a prime.

It is a super-2 number, since 2×186664997² = 69687642210020018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (186664991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93332498 + 93332499.

It is an arithmetic number, because the mean of its divisors is an integer number (93332499).

Almost surely, 2^186664997 is an apocalyptic number.

It is an amenable number.

186664997 is a deficient number, since it is larger than the sum of its proper divisors (1).

186664997 is an equidigital number, since it uses as much as digits as its factorization.

186664997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 56.

The square root of 186664997 is about 13662.5399175995. The cubic root of 186664997 is about 571.5062215044.

The spelling of 186664997 in words is "one hundred eighty-six million, six hundred sixty-four thousand, nine hundred ninety-seven".