64666369 has 2 divisors, whose sum is σ = 64666370. Its totient is φ = 64666368.

The previous prime is 64666337. The next prime is 64666373. The reversal of 64666369 is 96366646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 9535744 = 7425^2 + 3088^2 .

It is a cyclic number.

It is not a de Polignac number, because 64666369 - 2⁵ = 64666337 is a prime.

It is a super-2 number, since 2×64666369² = 8363478559288322, which contains 22 as substring.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (64666669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32333184 + 32333185.

It is an arithmetic number, because the mean of its divisors is an integer number (32333185).

Almost surely, 2^64666369 is an apocalyptic number.

It is an amenable number.

64666369 is a deficient number, since it is larger than the sum of its proper divisors (1).

64666369 is an equidigital number, since it uses as much as digits as its factorization.

64666369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 46.

The square root of 64666369 is about 8041.5402131681. The cubic root of 64666369 is about 401.3834782035.

The spelling of 64666369 in words is "sixty-four million, six hundred sixty-six thousand, three hundred sixty-nine".