64055666 has 4 divisors (see below), whose sum is σ = 96083502. Its totient is φ = 32027832.

The previous prime is 64055659. The next prime is 64055671. The reversal of 64055666 is 66655046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66655046 = 2 ⋅33327523.

It can be written as a sum of positive squares in only one way, i.e., 60388441 + 3667225 = 7771^2 + 1915^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16013915 + ... + 16013918.

Almost surely, 2^64055666 is an apocalyptic number.

64055666 is a deficient number, since it is larger than the sum of its proper divisors (32027836).

64055666 is a wasteful number, since it uses less digits than its factorization.

64055666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32027835.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 64055666 is about 8003.4783688094. The cubic root of 64055666 is about 400.1159372265.

The spelling of 64055666 in words is "sixty-four million, fifty-five thousand, six hundred sixty-six".