1666222021160 has 16 divisors (see below), whose sum is σ = 3748999547700. Its totient is φ = 666488808448.

The previous prime is 1666222021117. The next prime is 1666222021183. The reversal of 1666222021160 is 611202226661.

It can be written as a sum of positive squares in 2 ways, for example, as 1639787813764 + 26434207396 = 1280542^2 + 162586^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1666222021160.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20827775225 + ... + 20827775304.

Almost surely, 2^{1666222021160} is an apocalyptic number.

1666222021160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666222021160 is an abundant number, since it is smaller than the sum of its proper divisors (2082777526540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666222021160 is a wasteful number, since it uses less digits than its factorization.

1666222021160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41655550540 (or 41655550536 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 1666222021160 in words is "one trillion, six hundred sixty-six billion, two hundred twenty-two million, twenty-one thousand, one hundred sixty".