66566445 has 16 divisors (see below), whose sum is σ = 116188992. Its totient is φ = 32274560.

The previous prime is 66566419. The next prime is 66566447. The reversal of 66566445 is 54466566.

It is a happy number.

It is not a de Polignac number, because 66566445 - 2⁵ = 66566413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66566397 and 66566406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566447) 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, 201552 + ... + 201881.

It is an arithmetic number, because the mean of its divisors is an integer number (7261812).

Almost surely, 2^66566445 is an apocalyptic number.

It is an amenable number.

66566445 is a deficient number, since it is larger than the sum of its proper divisors (49622547).

66566445 is a wasteful number, since it uses less digits than its factorization.

66566445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403452.

The product of its digits is 518400, while the sum is 42.

The square root of 66566445 is about 8158.8262023406. The cubic root of 66566445 is about 405.2768416595.

The spelling of 66566445 in words is "sixty-six million, five hundred sixty-six thousand, four hundred forty-five".