66664446 has 64 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 19514880.

The previous prime is 66664441. The next prime is 66664447. The reversal of 66664446 is 64446666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66664398 and 66664407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91335 + ... + 92061.

It is an arithmetic number, because the mean of its divisors is an integer number (2358720).

Almost surely, 2^66664446 is an apocalyptic number.

66664446 is an abundant number, since it is smaller than the sum of its proper divisors (84293634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66664446 is a wasteful number, since it uses less digits than its factorization.

66664446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809.

The product of its digits is 497664, while the sum is 42.

The square root of 66664446 is about 8164.8298206393. The cubic root of 66664446 is about 405.4756308072.

The spelling of 66664446 in words is "sixty-six million, six hundred sixty-four thousand, four hundred forty-six".