1666320159850 has 12 divisors (see below), whose sum is σ = 3099355497414. Its totient is φ = 666528063920.

The previous prime is 1666320159839. The next prime is 1666320159899. The reversal of 1666320159850 is 589510236661.

It can be written as a sum of positive squares in 3 ways, for example, as 688470127081 + 977850032769 = 829741^2 + 988863^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16663201549 + ... + 16663201648.

Almost surely, 2^{1666320159850} is an apocalyptic number.

1666320159850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666320159850 is a deficient number, since it is larger than the sum of its proper divisors (1433035337564).

1666320159850 is a wasteful number, since it uses less digits than its factorization.

1666320159850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33326403209 (or 33326403204 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 1666320159850 in words is "one trillion, six hundred sixty-six billion, three hundred twenty million, one hundred fifty-nine thousand, eight hundred fifty".