191808078421156 has 12 divisors (see below), whose sum is σ = 335665166175360. Its totient is φ = 95903745228200.

The previous prime is 191808078421103. The next prime is 191808078421181. The reversal of 191808078421156 is 651124870808191.

191808078421156 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 191808078421094 and 191808078421103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72024316 + ... + 74639923.

It is an arithmetic number, because the mean of its divisors is an integer number (27972097181280).

Almost surely, 2^{191808078421156} is an apocalyptic number.

It is an amenable number.

191808078421156 is a deficient number, since it is larger than the sum of its proper divisors (143857087754204).

191808078421156 is a wasteful number, since it uses less digits than its factorization.

191808078421156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146991194 (or 146991192 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 61.

The spelling of 191808078421156 in words is "one hundred ninety-one trillion, eight hundred eight billion, seventy-eight million, four hundred twenty-one thousand, one hundred fifty-six".