231680165566 has 4 divisors (see below), whose sum is σ = 347520248352. Its totient is φ = 115840082782.

The previous prime is 231680165531. The next prime is 231680165621. The reversal of 231680165566 is 665561086132.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57920041390 + ... + 57920041393.

It is an arithmetic number, because the mean of its divisors is an integer number (86880062088).

Almost surely, 2^231680165566 is an apocalyptic number.

231680165566 is a deficient number, since it is larger than the sum of its proper divisors (115840082786).

231680165566 is a wasteful number, since it uses less digits than its factorization.

231680165566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115840082785.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 231680165566 in words is "two hundred thirty-one billion, six hundred eighty million, one hundred sixty-five thousand, five hundred sixty-six".