66504002 has 4 divisors (see below), whose sum is σ = 99756006. Its totient is φ = 33252000.

The previous prime is 66503993. The next prime is 66504007. The reversal of 66504002 is 20040566.

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., 46799281 + 19704721 = 6841^2 + 4439^2 .

It is not an unprimeable number, because it can be changed into a prime (66504007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16625999 + ... + 16626002.

Almost surely, 2^66504002 is an apocalyptic number.

66504002 is a deficient number, since it is larger than the sum of its proper divisors (33252004).

66504002 is a wasteful number, since it uses less digits than its factorization.

66504002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33252003.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 66504002 is about 8154.9985898221. The cubic root of 66504002 is about 405.1500779976.

Adding to 66504002 its sum of digits (23), we get a square (66504025 = 8155²).

Adding to 66504002 its reverse (20040566), we get a palindrome (86544568).

The spelling of 66504002 in words is "sixty-six million, five hundred four thousand, two".