64646066 has 4 divisors (see below), whose sum is σ = 96969102. Its totient is φ = 32323032.

The previous prime is 64646033. The next prime is 64646069. The reversal of 64646066 is 66064646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66064646 = 2 ⋅33032323.

It can be written as a sum of positive squares in only one way, i.e., 52983841 + 11662225 = 7279^2 + 3415^2 .

It is a super-2 number, since 2×64646066² = 8358227698552712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64646069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16161515 + ... + 16161518.

Almost surely, 2^64646066 is an apocalyptic number.

64646066 is a deficient number, since it is larger than the sum of its proper divisors (32323036).

64646066 is a wasteful number, since it uses less digits than its factorization.

64646066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32323035.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 64646066 is about 8040.2777315215. The cubic root of 64646066 is about 401.3414669701.

The spelling of 64646066 in words is "sixty-four million, six hundred forty-six thousand, sixty-six".