19144709640 has 800 divisors, whose sum is σ = 79063490880. Its totient is φ = 4146557184.

The previous prime is 19144709593. The next prime is 19144709641. The reversal of 19144709640 is 4690744191.

19144709640 is a `hidden beast` number, since 1 + 91 + 4 + 470 + 96 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19144709641) by changing a digit.

It is a polite number, since it can be written in 199 ways as a sum of consecutive naturals, for example, 178922467 + ... + 178922573.

Almost surely, 2^19144709640 is an apocalyptic number.

19144709640 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 19144709640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39531745440).

19144709640 is an abundant number, since it is smaller than the sum of its proper divisors (59918781240).

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

19144709640 is a wasteful number, since it uses less digits than its factorization.

19144709640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 19144709640 in words is "nineteen billion, one hundred forty-four million, seven hundred nine thousand, six hundred forty".