15545644660 has 96 divisors (see below), whose sum is σ = 41114126592. Its totient is φ = 4805498880.

The previous prime is 15545644643. The next prime is 15545644663. The reversal of 15545644660 is 6644654551.

It is a self number, because there is not a number n which added to its sum of digits gives 15545644660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15545644663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21061 + ... + 177580.

It is an arithmetic number, because the mean of its divisors is an integer number (428272152).

Almost surely, 2^15545644660 is an apocalyptic number.

15545644660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15545644660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20557063296).

15545644660 is an abundant number, since it is smaller than the sum of its proper divisors (25568481932).

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

15545644660 is a wasteful number, since it uses less digits than its factorization.

15545644660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198713 (or 198711 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 15545644660 in words is "fifteen billion, five hundred forty-five million, six hundred forty-four thousand, six hundred sixty".