64666344366646 has 32 divisors (see below), whose sum is σ = 106014110727168. Its totient is φ = 29339241927840.

The previous prime is 64666344366607. The next prime is 64666344366647.

64666344366646 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64666344366647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63769741 + ... + 64775863.

It is an arithmetic number, because the mean of its divisors is an integer number (3312940960224).

Almost surely, 2^{64666344366646} is an apocalyptic number.

64666344366646 is a deficient number, since it is larger than the sum of its proper divisors (41347766360522).

64666344366646 is a wasteful number, since it uses less digits than its factorization.

64666344366646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011556.

The product of its digits is 3869835264, while the sum is 70.

The spelling of 64666344366646 in words is "sixty-four trillion, six hundred sixty-six billion, three hundred forty-four million, three hundred sixty-six thousand, six hundred forty-six".