1661137115 has 16 divisors (see below), whose sum is σ = 2175646176. Its totient is φ = 1207507200.

The previous prime is 1661137109. The next prime is 1661137129. The reversal of 1661137115 is 5117311661.

It is not a de Polignac number, because 1661137115 - 2⁸ = 1661136859 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128069 + ... + 140441.

It is an arithmetic number, because the mean of its divisors is an integer number (135977886).

Almost surely, 2^1661137115 is an apocalyptic number.

1661137115 is a deficient number, since it is larger than the sum of its proper divisors (514509061).

1661137115 is a wasteful number, since it uses less digits than its factorization.

1661137115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14830.

The product of its digits is 3780, while the sum is 32.

The square root of 1661137115 is about 40757.0498809715. The cubic root of 1661137115 is about 1184.3184470599.

Adding to 1661137115 its reverse (5117311661), we get a palindrome (6778448776).

The spelling of 1661137115 in words is "one billion, six hundred sixty-one million, one hundred thirty-seven thousand, one hundred fifteen".