1666660711222 has 16 divisors (see below), whose sum is σ = 2850668547552. Its totient is φ = 723979313280.

The previous prime is 1666660711213. The next prime is 1666660711223. The reversal of 1666660711222 is 2221170666661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666660711223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1885362354 + ... + 1885363237.

It is an arithmetic number, because the mean of its divisors is an integer number (178166784222).

Almost surely, 2^{1666660711222} is an apocalyptic number.

1666660711222 is a deficient number, since it is larger than the sum of its proper divisors (1184007836330).

1666660711222 is a wasteful number, since it uses less digits than its factorization.

1666660711222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770725623.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 1666660711222 in words is "one trillion, six hundred sixty-six billion, six hundred sixty million, seven hundred eleven thousand, two hundred twenty-two".