233191655661 has 4 divisors (see below), whose sum is σ = 310922207552. Its totient is φ = 155461103772.

The previous prime is 233191655657. The next prime is 233191655701. The reversal of 233191655661 is 166556191332.

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 not a de Polignac number, because 233191655661 - 2² = 233191655657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 233191655661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233191655161) 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, 38865275941 + ... + 38865275946.

It is an arithmetic number, because the mean of its divisors is an integer number (77730551888).

Almost surely, 2^233191655661 is an apocalyptic number.

It is an amenable number.

233191655661 is a deficient number, since it is larger than the sum of its proper divisors (77730551891).

233191655661 is an equidigital number, since it uses as much as digits as its factorization.

233191655661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77730551890.

The product of its digits is 874800, while the sum is 48.

The spelling of 233191655661 in words is "two hundred thirty-three billion, one hundred ninety-one million, six hundred fifty-five thousand, six hundred sixty-one".