64661966 has 8 divisors (see below), whose sum is σ = 97691160. Its totient is φ = 32098248.

The previous prime is 64661963. The next prime is 64661983. The reversal of 64661966 is 66916646.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64661963) 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, 116021 + ... + 116576.

It is an arithmetic number, because the mean of its divisors is an integer number (12211395).

Almost surely, 2^64661966 is an apocalyptic number.

64661966 is a deficient number, since it is larger than the sum of its proper divisors (33029194).

64661966 is a wasteful number, since it uses less digits than its factorization.

64661966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232738.

The product of its digits is 279936, while the sum is 44.

The square root of 64661966 is about 8041.2664425450. The cubic root of 64661966 is about 401.3743682050.

The spelling of 64661966 in words is "sixty-four million, six hundred sixty-one thousand, nine hundred sixty-six".