64640466400066 has 32 divisors (see below), whose sum is σ = 101584005419520. Its totient is φ = 30810303849600.

The previous prime is 64640466400063. The next prime is 64640466400067. The reversal of 64640466400066 is 66000466404646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 64640466399986 and 64640466400022.

It is not an unprimeable number, because it can be changed into a prime (64640466400063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399820606 + ... + 399982246.

It is an arithmetic number, because the mean of its divisors is an integer number (3174500169360).

Almost surely, 2^{64640466400066} is an apocalyptic number.

64640466400066 is a deficient number, since it is larger than the sum of its proper divisors (36943539019454).

64640466400066 is a wasteful number, since it uses less digits than its factorization.

64640466400066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258010.

The product of its (nonzero) digits is 11943936, while the sum is 52.

The spelling of 64640466400066 in words is "sixty-four trillion, six hundred forty billion, four hundred sixty-six million, four hundred thousand, sixty-six".