64540666 has 8 divisors (see below), whose sum is σ = 96865344. Its totient is φ = 32252220.

The previous prime is 64540643. The next prime is 64540669. The reversal of 64540666 is 66604546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (64540669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4050 + ... + 12061.

It is an arithmetic number, because the mean of its divisors is an integer number (12108168).

Almost surely, 2^64540666 is an apocalyptic number.

64540666 is a deficient number, since it is larger than the sum of its proper divisors (32324678).

64540666 is a wasteful number, since it uses less digits than its factorization.

64540666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18116.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 64540666 is about 8033.7205577491. The cubic root of 64540666 is about 401.1232304312.

The spelling of 64540666 in words is "sixty-four million, five hundred forty thousand, six hundred sixty-six".