19549837216 has 96 divisors (see below), whose sum is σ = 47476775808. Its totient is φ = 7716695040.

The previous prime is 19549837199. The next prime is 19549837231. The reversal of 19549837216 is 61273894591.

It is a happy number.

It is a super-2 number, since 2×19549837216² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1335151 + ... + 1349713.

It is an arithmetic number, because the mean of its divisors is an integer number (494549748).

Almost surely, 2^19549837216 is an apocalyptic number.

19549837216 is a gapful number since it is divisible by the number (16) 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 19549837216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23738387904).

19549837216 is an abundant number, since it is smaller than the sum of its proper divisors (27926938592).

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

19549837216 is a wasteful number, since it uses less digits than its factorization.

19549837216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15054 (or 15046 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 55.

The spelling of 19549837216 in words is "nineteen billion, five hundred forty-nine million, eight hundred thirty-seven thousand, two hundred sixteen".