191042233661 has 4 divisors (see below), whose sum is σ = 191883829632. Its totient is φ = 190200637692.

The previous prime is 191042233651. The next prime is 191042233703. The reversal of 191042233661 is 166332240191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191042233661 - 2⁶ = 191042233597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191042233621) 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, 420797645 + ... + 420798098.

It is an arithmetic number, because the mean of its divisors is an integer number (47970957408).

Almost surely, 2^191042233661 is an apocalyptic number.

It is an amenable number.

191042233661 is a deficient number, since it is larger than the sum of its proper divisors (841595971).

191042233661 is an equidigital number, since it uses as much as digits as its factorization.

191042233661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841595970.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 191042233661 in words is "one hundred ninety-one billion, forty-two million, two hundred thirty-three thousand, six hundred sixty-one".