19749013326 has 256 divisors, whose sum is σ = 55074816000. Its totient is φ = 5118629760.

The previous prime is 19749013313. The next prime is 19749013343. The reversal of 19749013326 is 62331094791.

19749013326 is a `hidden beast` number, since 1 + 9 + 7 + 490 + 133 + 26 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23822280 + ... + 23823108.

It is an arithmetic number, because the mean of its divisors is an integer number (215136000).

Almost surely, 2^19749013326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19749013326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27537408000).

19749013326 is an abundant number, since it is smaller than the sum of its proper divisors (35325802674).

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

19749013326 is a wasteful number, since it uses less digits than its factorization.

19749013326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 998 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 19749013326 in words is "nineteen billion, seven hundred forty-nine million, thirteen thousand, three hundred twenty-six".