20143504666 has 4 divisors (see below), whose sum is σ = 30215257002. Its totient is φ = 10071752332.

The previous prime is 20143504613. The next prime is 20143504691. The reversal of 20143504666 is 66640534102.

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., 16609796641 + 3533708025 = 128879^2 + 59445^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5035876165 + ... + 5035876168.

Almost surely, 2^20143504666 is an apocalyptic number.

20143504666 is a deficient number, since it is larger than the sum of its proper divisors (10071752336).

20143504666 is a wasteful number, since it uses less digits than its factorization.

20143504666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10071752335.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 20143504666 in words is "twenty billion, one hundred forty-three million, five hundred four thousand, six hundred sixty-six".