1660339493 has 4 divisors (see below), whose sum is σ = 1758006540. Its totient is φ = 1562672448.

The previous prime is 1660339489. The next prime is 1660339501. The reversal of 1660339493 is 3949330661.

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 1386668644 + 273670849 = 37238^2 + 16543^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660339493 - 2² = 1660339489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660339423) 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, 48833498 + ... + 48833531.

It is an arithmetic number, because the mean of its divisors is an integer number (439501635).

Almost surely, 2^1660339493 is an apocalyptic number.

It is an amenable number.

1660339493 is a deficient number, since it is larger than the sum of its proper divisors (97667047).

1660339493 is an equidigital number, since it uses as much as digits as its factorization.

1660339493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97667046.

The product of its (nonzero) digits is 314928, while the sum is 44.

The square root of 1660339493 is about 40747.2636259173. The cubic root of 1660339493 is about 1184.1288601248.

The spelling of 1660339493 in words is "one billion, six hundred sixty million, three hundred thirty-nine thousand, four hundred ninety-three".