66880252018 has 4 divisors (see below), whose sum is σ = 100320378030. Its totient is φ = 33440126008.

The previous prime is 66880252001. The next prime is 66880252063. The reversal of 66880252018 is 81025208866.

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., 62266718089 + 4613533929 = 249533^2 + 67923^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16720063003 + ... + 16720063006.

Almost surely, 2^66880252018 is an apocalyptic number.

66880252018 is a deficient number, since it is larger than the sum of its proper divisors (33440126012).

66880252018 is a wasteful number, since it uses less digits than its factorization.

66880252018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33440126011.

The product of its (nonzero) digits is 368640, while the sum is 46.

The spelling of 66880252018 in words is "sixty-six billion, eight hundred eighty million, two hundred fifty-two thousand, eighteen".