115666661650 has 48 divisors (see below), whose sum is σ = 216040250664. Its totient is φ = 46073364480.

The previous prime is 115666661639. The next prime is 115666661651. The reversal of 115666661650 is 56166666511.

It can be written as a sum of positive squares in 12 ways, for example, as 317445489 + 115349216161 = 17817^2 + 339631^2 .

It is a junction number, because it is equal to n+sod(n) for n = 115666661594 and 115666661603.

It is not an unprimeable number, because it can be changed into a prime (115666661651) 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 23 ways as a sum of consecutive naturals, for example, 19043014 + ... + 19049086.

Almost surely, 2^115666661650 is an apocalyptic number.

115666661650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

115666661650 is a deficient number, since it is larger than the sum of its proper divisors (100373589014).

115666661650 is a wasteful number, since it uses less digits than its factorization.

115666661650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7615 (or 7610 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 115666661650 in words is "one hundred fifteen billion, six hundred sixty-six million, six hundred sixty-one thousand, six hundred fifty".