1666655000 has 40 divisors (see below), whose sum is σ = 3904984380. Its totient is φ = 666660000.

The previous prime is 1666654999. The next prime is 1666655033. The reversal of 1666655000 is 5566661.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 161666 + ... + 171665.

Almost surely, 2^1666655000 is an apocalyptic number.

1666655000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666655000 is an abundant number, since it is smaller than the sum of its proper divisors (2238329380).

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

1666655000 is an equidigital number, since it uses as much as digits as its factorization.

1666655000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333357 (or 333338 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1666655000 is about 40824.6861592346. The cubic root of 1666655000 is about 1185.6283350177.

The spelling of 1666655000 in words is "one billion, six hundred sixty-six million, six hundred fifty-five thousand".