191190646427 has 6 divisors (see below), whose sum is σ = 210151702404. Its totient is φ = 173809678460.

The previous prime is 191190646403. The next prime is 191190646481. The reversal of 191190646427 is 724646091191.

It is not a de Polignac number, because 191190646427 - 2¹⁰ = 191190645403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191190646627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 790043873 + ... + 790044114.

It is an arithmetic number, because the mean of its divisors is an integer number (35025283734).

Almost surely, 2^191190646427 is an apocalyptic number.

191190646427 is a deficient number, since it is larger than the sum of its proper divisors (18961055977).

191190646427 is a wasteful number, since it uses less digits than its factorization.

191190646427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580088009 (or 1580087998 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 191190646427 in words is "one hundred ninety-one billion, one hundred ninety million, six hundred forty-six thousand, four hundred twenty-seven".