20660362666 has 4 divisors (see below), whose sum is σ = 30990544002. Its totient is φ = 10330181332.

The previous prime is 20660362663. The next prime is 20660362669. The reversal of 20660362666 is 66626306602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20660362663) and next prime (20660362669).

It can be written as a sum of positive squares in only one way, i.e., 18310149225 + 2350213441 = 135315^2 + 48479^2 .

It is not an unprimeable number, because it can be changed into a prime (20660362663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5165090665 + ... + 5165090668.

Almost surely, 2^20660362666 is an apocalyptic number.

20660362666 is a deficient number, since it is larger than the sum of its proper divisors (10330181336).

20660362666 is a wasteful number, since it uses less digits than its factorization.

20660362666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10330181335.

The product of its (nonzero) digits is 559872, while the sum is 43.

The spelling of 20660362666 in words is "twenty billion, six hundred sixty million, three hundred sixty-two thousand, six hundred sixty-six".