10115666550 has 144 divisors (see below), whose sum is σ = 29894894640. Its totient is φ = 2452137600.

The previous prime is 10115666521. The next prime is 10115666551. The reversal of 10115666550 is 5566651101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10115666551) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 590506 + ... + 607394.

It is an arithmetic number, because the mean of its divisors is an integer number (207603435).

Almost surely, 2^10115666550 is an apocalyptic number.

10115666550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 10115666550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14947447320).

10115666550 is an abundant number, since it is smaller than the sum of its proper divisors (19779228090).

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

10115666550 is a wasteful number, since it uses less digits than its factorization.

10115666550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16940 (or 16910 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

It can be divided in two parts, 101 and 15666550, that added together give a palindrome (15666651).

The spelling of 10115666550 in words is "ten billion, one hundred fifteen million, six hundred sixty-six thousand, five hundred fifty".