661115113 has 8 divisors (see below), whose sum is σ = 677704320. Its totient is φ = 644631120.

The previous prime is 661115111. The next prime is 661115129. The reversal of 661115113 is 311511166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661115113 - 2¹ = 661115111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661115111) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13503 + ... + 38788.

It is an arithmetic number, because the mean of its divisors is an integer number (84713040).

Almost surely, 2^661115113 is an apocalyptic number.

It is an amenable number.

661115113 is a deficient number, since it is larger than the sum of its proper divisors (16589207).

661115113 is a wasteful number, since it uses less digits than its factorization.

661115113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52607.

The product of its digits is 540, while the sum is 25.

The square root of 661115113 is about 25712.1588552965. The cubic root of 661115113 is about 871.1488381248.

Adding to 661115113 its reverse (311511166), we get a palindrome (972626279).

The spelling of 661115113 in words is "six hundred sixty-one million, one hundred fifteen thousand, one hundred thirteen".