15166821000 has 128 divisors (see below), whose sum is σ = 49378118400. Its totient is φ = 3868620800.

The previous prime is 15166820953. The next prime is 15166821001. The reversal of 15166821000 is 12866151.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (15166821001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40905 + ... + 178904.

It is an arithmetic number, because the mean of its divisors is an integer number (385766550).

Almost surely, 2^15166821000 is an apocalyptic number.

15166821000 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 15166821000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24689059200).

15166821000 is an abundant number, since it is smaller than the sum of its proper divisors (34211297400).

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

15166821000 is a wasteful number, since it uses less digits than its factorization.

15166821000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219856 (or 219842 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The spelling of 15166821000 in words is "fifteen billion, one hundred sixty-six million, eight hundred twenty-one thousand".