64516666 has 16 divisors (see below), whose sum is σ = 107861760. Its totient is φ = 28762560.

The previous prime is 64516663. The next prime is 64516667. The reversal of 64516666 is 66661546.

It is not an unprimeable number, because it can be changed into a prime (64516663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49290 + ... + 50581.

It is an arithmetic number, because the mean of its divisors is an integer number (6741360).

Almost surely, 2^64516666 is an apocalyptic number.

64516666 is a deficient number, since it is larger than the sum of its proper divisors (43345094).

64516666 is a wasteful number, since it uses less digits than its factorization.

64516666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99909.

The product of its digits is 155520, while the sum is 40.

The square root of 64516666 is about 8032.2267149278. The cubic root of 64516666 is about 401.0735038961.

The spelling of 64516666 in words is "sixty-four million, five hundred sixteen thousand, six hundred sixty-six".