14640220666 has 4 divisors (see below), whose sum is σ = 21960331002. Its totient is φ = 7320110332.

The previous prime is 14640220663. The next prime is 14640220709. The reversal of 14640220666 is 66602204641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66602204641 = 7 ⋅9514600663.

It can be written as a sum of positive squares in only one way, i.e., 12749797225 + 1890423441 = 112915^2 + 43479^2 .

It is a super-2 number, since 2×14640220666² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (14640220663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3660055165 + ... + 3660055168.

Almost surely, 2^14640220666 is an apocalyptic number.

14640220666 is a deficient number, since it is larger than the sum of its proper divisors (7320110336).

14640220666 is an equidigital number, since it uses as much as digits as its factorization.

14640220666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7320110335.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 14640220666 in words is "fourteen billion, six hundred forty million, two hundred twenty thousand, six hundred sixty-six".