191942764384878 has 40 divisors (see below), whose sum is σ = 463178123748648. Its totient is φ = 59059312117776.

The previous prime is 191942764384841. The next prime is 191942764384897. The reversal of 191942764384878 is 878483467249191.

191942764384878 is a `hidden beast` number, since 1 + 9 + 1 + 9 + 4 + 2 + 76 + 438 + 48 + 78 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a junction number, because it is equal to n+sod(n) for n = 191942764384797 and 191942764384806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 45570454776 + ... + 45570458987.

Almost surely, 2^{191942764384878} is an apocalyptic number.

191942764384878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

191942764384878 is an abundant number, since it is smaller than the sum of its proper divisors (271235359363770).

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

191942764384878 is a wasteful number, since it uses less digits than its factorization.

191942764384878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91140913790 (or 91140913781 counting only the distinct ones).

The product of its digits is 4682022912, while the sum is 81.

The spelling of 191942764384878 in words is "one hundred ninety-one trillion, nine hundred forty-two billion, seven hundred sixty-four million, three hundred eighty-four thousand, eight hundred seventy-eight".