19450137608 has 64 divisors (see below), whose sum is σ = 40328280000. Its totient is φ = 8720588800.

The previous prime is 19450137527. The next prime is 19450137643. The reversal of 19450137608 is 80673105491.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 3513803 + ... + 3519333.

It is an arithmetic number, because the mean of its divisors is an integer number (630129375).

Almost surely, 2^19450137608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19450137608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20164140000).

19450137608 is an abundant number, since it is smaller than the sum of its proper divisors (20878142392).

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

19450137608 is a wasteful number, since it uses less digits than its factorization.

19450137608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6086 (or 6082 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 19450137608 in words is "nineteen billion, four hundred fifty million, one hundred thirty-seven thousand, six hundred eight".