1660110221 has 32 divisors (see below), whose sum is σ = 2105241600. Its totient is φ = 1271609280.

The previous prime is 1660110211. The next prime is 1660110223. The reversal of 1660110221 is 1220110661.

It is a cyclic number.

It is not a de Polignac number, because 1660110221 - 2³⁰ = 586368397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1660110193 and 1660110202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660110223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1165916 + ... + 1167338.

It is an arithmetic number, because the mean of its divisors is an integer number (65788800).

Almost surely, 2^1660110221 is an apocalyptic number.

1660110221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1660110221 is a deficient number, since it is larger than the sum of its proper divisors (445131379).

1660110221 is a wasteful number, since it uses less digits than its factorization.

1660110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1660110221 is about 40744.4501864978. The cubic root of 1660110221 is about 1184.0743531820.

Adding to 1660110221 its reverse (1220110661), we get a palindrome (2880220882).

The spelling of 1660110221 in words is "one billion, six hundred sixty million, one hundred ten thousand, two hundred twenty-one".