1866666660 has 48 divisors (see below), whose sum is σ = 5453917056. Its totient is φ = 476134912.

The previous prime is 1866666619. The next prime is 1866666661. The reversal of 1866666660 is 666666681.

It is not an unprimeable number, because it can be changed into a prime (1866666661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674949 + ... + 677708.

It is an arithmetic number, because the mean of its divisors is an integer number (113623272).

Almost surely, 2^1866666660 is an apocalyptic number.

1866666660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866666660 is an abundant number, since it is smaller than the sum of its proper divisors (3587250396).

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

1866666660 is a wasteful number, since it uses less digits than its factorization.

1866666660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352692 (or 1352690 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The square root of 1866666660 is about 43204.9379122341. The cubic root of 1866666660 is about 1231.2764988328.

The spelling of 1866666660 in words is "one billion, eight hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty".