19944177408 has 108 divisors (see below), whose sum is σ = 58447080328. Its totient is φ = 6539028480.

The previous prime is 19944177401. The next prime is 19944177413. The reversal of 19944177408 is 80477144991.

19944177408 is a `hidden beast` number, since 1 + 99 + 441 + 77 + 40 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944177401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69591 + ... + 211497.

Almost surely, 2^19944177408 is an apocalyptic number.

19944177408 is a gapful number since it is divisible by the number (18) 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 19944177408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29223540164).

19944177408 is an abundant number, since it is smaller than the sum of its proper divisors (38502902920).

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

19944177408 is a wasteful number, since it uses less digits than its factorization.

19944177408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141990 (or 141973 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 19944177408 in words is "nineteen billion, nine hundred forty-four million, one hundred seventy-seven thousand, four hundred eight".