64315666 has 4 divisors (see below), whose sum is σ = 96473502. Its totient is φ = 32157832.

The previous prime is 64315663. The next prime is 64315673. The reversal of 64315666 is 66651346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66651346 = 2 ⋅33325673.

It can be written as a sum of positive squares in only one way, i.e., 63920025 + 395641 = 7995^2 + 629^2 .

It is not an unprimeable number, because it can be changed into a prime (64315661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16078915 + ... + 16078918.

Almost surely, 2^64315666 is an apocalyptic number.

64315666 is a deficient number, since it is larger than the sum of its proper divisors (32157836).

64315666 is a wasteful number, since it uses less digits than its factorization.

64315666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32157835.

The product of its digits is 77760, while the sum is 37.

The square root of 64315666 is about 8019.7048574121. The cubic root of 64315666 is about 400.6565592353.

The spelling of 64315666 in words is "sixty-four million, three hundred fifteen thousand, six hundred sixty-six".