661110110115 has 64 divisors (see below), whose sum is σ = 1303632562176. Its totient is φ = 278598039552.

The previous prime is 661110110093. The next prime is 661110110123. The reversal of 661110110115 is 511011011166.

It is not a de Polignac number, because 661110110115 - 2¹⁰ = 661110109091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 688267 + ... + 1340123.

It is an arithmetic number, because the mean of its divisors is an integer number (20369258784).

Almost surely, 2^661110110115 is an apocalyptic number.

661110110115 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

661110110115 is a deficient number, since it is larger than the sum of its proper divisors (642522452061).

661110110115 is a wasteful number, since it uses less digits than its factorization.

661110110115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652628.

The product of its (nonzero) digits is 180, while the sum is 24.

The spelling of 661110110115 in words is "six hundred sixty-one billion, one hundred ten million, one hundred ten thousand, one hundred fifteen".