1666343446164 has 48 divisors (see below), whose sum is σ = 4323771258240. Its totient is φ = 554982183360.

The previous prime is 1666343446139. The next prime is 1666343446171. The reversal of 1666343446164 is 4616443436661.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1666343446164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6337672 + ... + 6595359.

It is an arithmetic number, because the mean of its divisors is an integer number (90078567880).

Almost surely, 2^{1666343446164} is an apocalyptic number.

It is an amenable number.

1666343446164 is an abundant number, since it is smaller than the sum of its proper divisors (2657427812076).

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

1666343446164 is a wasteful number, since it uses less digits than its factorization.

1666343446164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12934237 (or 12934229 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 54.

The spelling of 1666343446164 in words is "one trillion, six hundred sixty-six billion, three hundred forty-three million, four hundred forty-six thousand, one hundred sixty-four".