66663345 has 32 divisors (see below), whose sum is σ = 122745600. Its totient is φ = 30263040.

The previous prime is 66663283. The next prime is 66663353. The reversal of 66663345 is 54336666.

It is a happy number.

It is not a de Polignac number, because 66663345 - 2⁷ = 66663217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13515 + ... + 17775.

It is an arithmetic number, because the mean of its divisors is an integer number (3835800).

Almost surely, 2^66663345 is an apocalyptic number.

It is an amenable number.

66663345 is a deficient number, since it is larger than the sum of its proper divisors (56082255).

66663345 is a wasteful number, since it uses less digits than its factorization.

66663345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4425.

The product of its digits is 233280, while the sum is 39.

The square root of 66663345 is about 8164.7623970328. The cubic root of 66663345 is about 405.4733985772.

It can be divided in two parts, 6666 and 3345, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 66663345 in words is "sixty-six million, six hundred sixty-three thousand, three hundred forty-five".