1660514221 has 4 divisors (see below), whose sum is σ = 1691844732. Its totient is φ = 1629183712.

The previous prime is 1660514209. The next prime is 1660514237. The reversal of 1660514221 is 1224150661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 412658596 + 1247855625 = 20314^2 + 35325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660514221 - 2²¹ = 1658417069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1660514221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660514521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15665176 + ... + 15665281.

It is an arithmetic number, because the mean of its divisors is an integer number (422961183).

Almost surely, 2^1660514221 is an apocalyptic number.

It is an amenable number.

1660514221 is a deficient number, since it is larger than the sum of its proper divisors (31330511).

1660514221 is an equidigital number, since it uses as much as digits as its factorization.

1660514221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31330510.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1660514221 is about 40749.4076153261. The cubic root of 1660514221 is about 1184.1703964513.

Adding to 1660514221 its reverse (1224150661), we get a palindrome (2884664882).

The spelling of 1660514221 in words is "one billion, six hundred sixty million, five hundred fourteen thousand, two hundred twenty-one".