15199819866 has 144 divisors (see below), whose sum is σ = 41784148224. Its totient is φ = 3908520000.

The previous prime is 15199819847. The next prime is 15199819879. The reversal of 15199819866 is 66891899151.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1534911 + ... + 1544781.

It is an arithmetic number, because the mean of its divisors is an integer number (290167696).

Almost surely, 2^15199819866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15199819866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20892074112).

15199819866 is an abundant number, since it is smaller than the sum of its proper divisors (26584328358).

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

15199819866 is a wasteful number, since it uses less digits than its factorization.

15199819866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10009 (or 9995 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 63.

The spelling of 15199819866 in words is "fifteen billion, one hundred ninety-nine million, eight hundred nineteen thousand, eight hundred sixty-six".