15665105550 has 96 divisors (see below), whose sum is σ = 39158645472. Its totient is φ = 4144250880.

The previous prime is 15665105543. The next prime is 15665105563. The reversal of 15665105550 is 5550156651.

It is a junction number, because it is equal to n+sod(n) for n = 15665105499 and 15665105508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17861712 + ... + 17862588.

It is an arithmetic number, because the mean of its divisors is an integer number (407902557).

Almost surely, 2^15665105550 is an apocalyptic number.

15665105550 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 15665105550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19579322736).

15665105550 is an abundant number, since it is smaller than the sum of its proper divisors (23493539922).

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

15665105550 is a wasteful number, since it uses less digits than its factorization.

15665105550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 15665105550 in words is "fifteen billion, six hundred sixty-five million, one hundred five thousand, five hundred fifty".