1666744190 has 16 divisors (see below), whose sum is σ = 3023764992. Its totient is φ = 661447584.

The previous prime is 1666744169. The next prime is 1666744229. The reversal of 1666744190 is 914476661.

It is a super-2 number, since 2×1666744190² = 5556072389797512200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654929 + ... + 657468.

It is an arithmetic number, because the mean of its divisors is an integer number (188985312).

Almost surely, 2^1666744190 is an apocalyptic number.

1666744190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666744190 is a deficient number, since it is larger than the sum of its proper divisors (1357020802).

1666744190 is a wasteful number, since it uses less digits than its factorization.

1666744190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312531.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1666744190 is about 40825.7784983949. The cubic root of 1666744190 is about 1185.6494840267.

The spelling of 1666744190 in words is "one billion, six hundred sixty-six million, seven hundred forty-four thousand, one hundred ninety".