1661459115 has 16 divisors (see below), whose sum is σ = 2661523200. Its totient is φ = 885048672.

The previous prime is 1661459087. The next prime is 1661459141. The reversal of 1661459115 is 5119541661.

It is not a de Polignac number, because 1661459115 - 2⁵ = 1661459083 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53425 + ... + 78594.

It is an arithmetic number, because the mean of its divisors is an integer number (166345200).

Almost surely, 2^1661459115 is an apocalyptic number.

1661459115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661459115 is a deficient number, since it is larger than the sum of its proper divisors (1000064085).

1661459115 is a wasteful number, since it uses less digits than its factorization.

1661459115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132866.

The product of its digits is 32400, while the sum is 39.

The square root of 1661459115 is about 40760.9999264002. Note that the first 4 decimals coincide. The cubic root of 1661459115 is about 1184.3949661099.

The spelling of 1661459115 in words is "one billion, six hundred sixty-one million, four hundred fifty-nine thousand, one hundred fifteen".