1666893140 has 48 divisors (see below), whose sum is σ = 3823352064. Its totient is φ = 605404800.

The previous prime is 1666893133. The next prime is 1666893167. The reversal of 1666893140 is 413986661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 1666893091 and 1666893100.

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, 196262 + ... + 204578.

It is an arithmetic number, because the mean of its divisors is an integer number (79653168).

Almost surely, 2^1666893140 is an apocalyptic number.

1666893140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666893140 is an abundant number, since it is smaller than the sum of its proper divisors (2156458924).

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

1666893140 is a wasteful number, since it uses less digits than its factorization.

1666893140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248 (or 9246 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1666893140 is about 40827.6026727017. The cubic root of 1666893140 is about 1185.6848018300.

The spelling of 1666893140 in words is "one billion, six hundred sixty-six million, eight hundred ninety-three thousand, one hundred forty".