191771842140 has 288 divisors, whose sum is σ = 627306388800. Its totient is φ = 48632348160.

The previous prime is 191771842121. The next prime is 191771842153. The reversal of 191771842140 is 41248177191.

191771842140 is a `hidden beast` number, since 1 + 9 + 177 + 18 + 421 + 40 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 51702606 + ... + 51706314.

Almost surely, 2^191771842140 is an apocalyptic number.

191771842140 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 191771842140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313653194400).

191771842140 is an abundant number, since it is smaller than the sum of its proper divisors (435534546660).

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

191771842140 is a wasteful number, since it uses less digits than its factorization.

191771842140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954 (or 3923 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The spelling of 191771842140 in words is "one hundred ninety-one billion, seven hundred seventy-one million, eight hundred forty-two thousand, one hundred forty".