66149666 has 16 divisors (see below), whose sum is σ = 108446688. Its totient is φ = 30012000.

The previous prime is 66149653. The next prime is 66149689. The reversal of 66149666 is 66694166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10721 + ... + 15723.

It is an arithmetic number, because the mean of its divisors is an integer number (6777918).

Almost surely, 2^66149666 is an apocalyptic number.

66149666 is a deficient number, since it is larger than the sum of its proper divisors (42297022).

66149666 is a wasteful number, since it uses less digits than its factorization.

66149666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617.

The product of its digits is 279936, while the sum is 44.

The square root of 66149666 is about 8133.2444940503. The cubic root of 66149666 is about 404.4292442920.

The spelling of 66149666 in words is "sixty-six million, one hundred forty-nine thousand, six hundred sixty-six".