15661110116 has 12 divisors (see below), whose sum is σ = 27496218288. Its totient is φ = 7805047752.

The previous prime is 15661110097. The next prime is 15661110121. The reversal of 15661110116 is 61101116651.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6375446 + ... + 6377901.

It is an arithmetic number, because the mean of its divisors is an integer number (2291351524).

Almost surely, 2^15661110116 is an apocalyptic number.

It is an amenable number.

15661110116 is a deficient number, since it is larger than the sum of its proper divisors (11835108172).

15661110116 is a wasteful number, since it uses less digits than its factorization.

15661110116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12753658 (or 12753656 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 29.

Adding to 15661110116 its reverse (61101116651), we get a palindrome (76762226767).

The spelling of 15661110116 in words is "fifteen billion, six hundred sixty-one million, one hundred ten thousand, one hundred sixteen".