66614041666 has 4 divisors (see below), whose sum is σ = 99921062502. Its totient is φ = 33307020832.

The previous prime is 66614041661. The next prime is 66614041691.

66614041666 is nontrivially palindromic in base 10.

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., 48556326025 + 18057715641 = 220355^2 + 134379^2 .

It is not an unprimeable number, because it can be changed into a prime (66614041661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16653510415 + ... + 16653510418.

Almost surely, 2^66614041666 is an apocalyptic number.

66614041666 is a deficient number, since it is larger than the sum of its proper divisors (33307020836).

66614041666 is a wasteful number, since it uses less digits than its factorization.

66614041666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33307020835.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 66614041666 in words is "sixty-six billion, six hundred fourteen million, forty-one thousand, six hundred sixty-six".