64666331 has 2 divisors, whose sum is σ = 64666332. Its totient is φ = 64666330.

The previous prime is 64666237. The next prime is 64666337. The reversal of 64666331 is 13366646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64666331 - 2¹⁴ = 64649947 is a prime.

It is a super-2 number, since 2×64666331² = 8363468730003122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64666291 and 64666300.

It is not a weakly prime, because it can be changed into another prime (64666337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32333165 + 32333166.

It is an arithmetic number, because the mean of its divisors is an integer number (32333166).

Almost surely, 2^64666331 is an apocalyptic number.

64666331 is a deficient number, since it is larger than the sum of its proper divisors (1).

64666331 is an equidigital number, since it uses as much as digits as its factorization.

64666331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 35.

The square root of 64666331 is about 8041.5378504363. The cubic root of 64666331 is about 401.3833995816.

The spelling of 64666331 in words is "sixty-four million, six hundred sixty-six thousand, three hundred thirty-one".