11919842550 has 672 divisors, whose sum is σ = 43092670464. Its totient is φ = 2379456000.

The previous prime is 11919842549. The next prime is 11919842569. The reversal of 11919842550 is 5524891911.

11919842550 is a `hidden beast` number, since 1 + 1 + 9 + 1 + 98 + 4 + 2 + 550 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 11919842496 and 11919842505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 335 ways as a sum of consecutive naturals, for example, 87006082 + ... + 87006218.

Almost surely, 2^11919842550 is an apocalyptic number.

11919842550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11919842550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21546335232).

11919842550 is an abundant number, since it is smaller than the sum of its proper divisors (31172827914).

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

11919842550 is a wasteful number, since it uses less digits than its factorization.

11919842550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The spelling of 11919842550 in words is "eleven billion, nine hundred nineteen million, eight hundred forty-two thousand, five hundred fifty".