1660542013 has 4 divisors (see below), whose sum is σ = 1788276028. Its totient is φ = 1532808000.

The previous prime is 1660542011. The next prime is 1660542041. The reversal of 1660542013 is 3102450661.

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 189282564 + 1471259449 = 13758^2 + 38357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660542013 - 2¹ = 1660542011 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 (1660542011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63866988 + ... + 63867013.

It is an arithmetic number, because the mean of its divisors is an integer number (447069007).

Almost surely, 2^1660542013 is an apocalyptic number.

1660542013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1660542013 is a deficient number, since it is larger than the sum of its proper divisors (127734015).

1660542013 is a wasteful number, since it uses less digits than its factorization.

1660542013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127734014.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1660542013 is about 40749.7486249915. The cubic root of 1660542013 is about 1184.1770028948.

Adding to 1660542013 its reverse (3102450661), we get a palindrome (4762992674).

The spelling of 1660542013 in words is "one billion, six hundred sixty million, five hundred forty-two thousand, thirteen".