1666117056 has 56 divisors (see below), whose sum is σ = 4599944064. Its totient is φ = 531224320.

The previous prime is 1666117043. The next prime is 1666117069. The reversal of 1666117056 is 6507116661.

It is an interprime number because it is at equal distance from previous prime (1666117043) and next prime (1666117069).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 184230 + ... + 193061.

Almost surely, 2^1666117056 is an apocalyptic number.

1666117056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666117056 is an abundant number, since it is smaller than the sum of its proper divisors (2933827008).

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

1666117056 is a wasteful number, since it uses less digits than its factorization.

1666117056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377329 (or 377319 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1666117056 is about 40818.0971629007. The cubic root of 1666117056 is about 1185.5007600682.

The spelling of 1666117056 in words is "one billion, six hundred sixty-six million, one hundred seventeen thousand, fifty-six".