191219782163 has 4 divisors (see below), whose sum is σ = 194460795480. Its totient is φ = 187978768848.

The previous prime is 191219782157. The next prime is 191219782189. The reversal of 191219782163 is 361287912191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 361287912191 = 6079 ⋅59432129.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191219782163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191219782063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620506570 + ... + 1620506687.

It is an arithmetic number, because the mean of its divisors is an integer number (48615198870).

Almost surely, 2^191219782163 is an apocalyptic number.

191219782163 is a deficient number, since it is larger than the sum of its proper divisors (3241013317).

191219782163 is an equidigital number, since it uses as much as digits as its factorization.

191219782163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241013316.

The product of its digits is 326592, while the sum is 50.

The spelling of 191219782163 in words is "one hundred ninety-one billion, two hundred nineteen million, seven hundred eighty-two thousand, one hundred sixty-three".