66163445 has 4 divisors (see below), whose sum is σ = 79396140. Its totient is φ = 52930752.

The previous prime is 66163429. The next prime is 66163457. The reversal of 66163445 is 54436166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17247409 + 48916036 = 4153^2 + 6994^2 .

It is a cyclic number.

It is not a de Polignac number, because 66163445 - 2⁴ = 66163429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6616340 + ... + 6616349.

It is an arithmetic number, because the mean of its divisors is an integer number (19849035).

Almost surely, 2^66163445 is an apocalyptic number.

It is an amenable number.

66163445 is a deficient number, since it is larger than the sum of its proper divisors (13232695).

66163445 is a wasteful number, since it uses less digits than its factorization.

66163445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13232694.

The product of its digits is 51840, while the sum is 35.

The square root of 66163445 is about 8134.0915288679. The cubic root of 66163445 is about 404.4573232631.

The spelling of 66163445 in words is "sixty-six million, one hundred sixty-three thousand, four hundred forty-five".