66403066 has 4 divisors (see below), whose sum is σ = 99604602. Its totient is φ = 33201532.

The previous prime is 66403061. The next prime is 66403079. The reversal of 66403066 is 66030466.

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

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 2961841 = 7965^2 + 1721^2 .

It is not an unprimeable number, because it can be changed into a prime (66403061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16600765 + ... + 16600768.

Almost surely, 2^66403066 is an apocalyptic number.

66403066 is a deficient number, since it is larger than the sum of its proper divisors (33201536).

66403066 is a wasteful number, since it uses less digits than its factorization.

66403066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33201535.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 66403066 is about 8148.8076428395. The cubic root of 66403066 is about 404.9450029471.

The spelling of 66403066 in words is "sixty-six million, four hundred three thousand, sixty-six".