115666001020 has 24 divisors (see below), whose sum is σ = 242905950000. Its totient is φ = 46265000832.

The previous prime is 115666000993. The next prime is 115666001023. The reversal of 115666001020 is 20100666511.

It is a self number, because there is not a number n which added to its sum of digits gives 115666001020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115666001023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 819631 + ... + 950329.

It is an arithmetic number, because the mean of its divisors is an integer number (10121081250).

Almost surely, 2^115666001020 is an apocalyptic number.

115666001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115666001020 is an abundant number, since it is smaller than the sum of its proper divisors (127239948980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

115666001020 is a wasteful number, since it uses less digits than its factorization.

115666001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174957 (or 174955 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 115666001020 its reverse (20100666511), we get a palindrome (135766667531).

The spelling of 115666001020 in words is "one hundred fifteen billion, six hundred sixty-six million, one thousand, twenty".