191340783540 has 72 divisors (see below), whose sum is σ = 599122987008. Its totient is φ = 49378265280.

The previous prime is 191340783527. The next prime is 191340783541. The reversal of 191340783540 is 45387043191.

191340783540 is a `hidden beast` number, since 1 + 9 + 1 + 34 + 0 + 78 + 3 + 540 = 666.

191340783540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×191340783540² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 (191340783541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17139652 + ... + 17150811.

Almost surely, 2^191340783540 is an apocalyptic number.

191340783540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191340783540 is an abundant number, since it is smaller than the sum of its proper divisors (407782203468).

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

191340783540 is a wasteful number, since it uses less digits than its factorization.

191340783540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34290509 (or 34290504 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 191340783540 in words is "one hundred ninety-one billion, three hundred forty million, seven hundred eighty-three thousand, five hundred forty".