611666220 has 48 divisors (see below), whose sum is σ = 1868364288. Its totient is φ = 148282560.

The previous prime is 611666213. The next prime is 611666243. The reversal of 611666220 is 22666116.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462724 + ... + 464043.

It is an arithmetic number, because the mean of its divisors is an integer number (38924256).

Almost surely, 2^611666220 is an apocalyptic number.

611666220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

611666220 is an abundant number, since it is smaller than the sum of its proper divisors (1256698068).

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

611666220 is a wasteful number, since it uses less digits than its factorization.

611666220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926790 (or 926788 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 611666220 is about 24731.8867052233. The cubic root of 611666220 is about 848.8640974697.

The spelling of 611666220 in words is "six hundred eleven million, six hundred sixty-six thousand, two hundred twenty".