64966666 has 4 divisors (see below), whose sum is σ = 97450002. Its totient is φ = 32483332.

The previous prime is 64966661. The next prime is 64966703. The reversal of 64966666 is 66666946.

It is a happy number.

64966666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66666946 = 2 ⋅33333473.

It can be written as a sum of positive squares in only one way, i.e., 33930625 + 31036041 = 5825^2 + 5571^2 .

64966666 is a modest number, since divided by 6666 gives 6496 as remainder.

It is not an unprimeable number, because it can be changed into a prime (64966661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16241665 + ... + 16241668.

Almost surely, 2^64966666 is an apocalyptic number.

64966666 is a deficient number, since it is larger than the sum of its proper divisors (32483336).

64966666 is a wasteful number, since it uses less digits than its factorization.

64966666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32483335.

The product of its digits is 1679616, while the sum is 49.

The square root of 64966666 is about 8060.1901962671. The cubic root of 64966666 is about 402.0038323769.

It can be divided in two parts, 649 and 66666, that multiplied together give a palindrome (43266234).

The spelling of 64966666 in words is "sixty-four million, nine hundred sixty-six thousand, six hundred sixty-six".