1866650220 has 36 divisors (see below), whose sum is σ = 5662172880. Its totient is φ = 497773344.

The previous prime is 1866650207. The next prime is 1866650263. The reversal of 1866650220 is 220566681.

1866650220 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5184960 + ... + 5185319.

It is an arithmetic number, because the mean of its divisors is an integer number (157282580).

Almost surely, 2^1866650220 is an apocalyptic number.

1866650220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866650220 is an abundant number, since it is smaller than the sum of its proper divisors (3795522660).

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

1866650220 is a wasteful number, since it uses less digits than its factorization.

1866650220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10370294 (or 10370289 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1866650220 is about 43204.7476557843. The cubic root of 1866650220 is about 1231.2728841461.

It can be divided in two parts, 18666 and 50220, that added together give a palindrome (68886).

The spelling of 1866650220 in words is "one billion, eight hundred sixty-six million, six hundred fifty thousand, two hundred twenty".