191978940711 has 16 divisors (see below), whose sum is σ = 262862466048. Its totient is φ = 124570778400.

The previous prime is 191978940701. The next prime is 191978940721. The reversal of 191978940711 is 117049879191.

191978940711 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (191978940701) and next prime (191978940721).

It is not a de Polignac number, because 191978940711 - 2⁵ = 191978940679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191978940701) 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 15 ways as a sum of consecutive naturals, for example, 3735675 + ... + 3786716.

It is an arithmetic number, because the mean of its divisors is an integer number (16428904128).

Almost surely, 2^191978940711 is an apocalyptic number.

191978940711 is a deficient number, since it is larger than the sum of its proper divisors (70883525337).

191978940711 is a wasteful number, since it uses less digits than its factorization.

191978940711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7522622.

The product of its (nonzero) digits is 1143072, while the sum is 57.

The spelling of 191978940711 in words is "one hundred ninety-one billion, nine hundred seventy-eight million, nine hundred forty thousand, seven hundred eleven".