161731828757 has 8 divisors (see below), whose sum is σ = 162094583616. Its totient is φ = 161369200512.

The previous prime is 161731828681. The next prime is 161731828793. The reversal of 161731828757 is 757828137161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161731828757 - 2¹⁸ = 161731566613 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 (161731828457) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 2809253 + ... + 2866245.

It is an arithmetic number, because the mean of its divisors is an integer number (20261822952).

Almost surely, 2^161731828757 is an apocalyptic number.

It is an amenable number.

161731828757 is a deficient number, since it is larger than the sum of its proper divisors (362754859).

161731828757 is an equidigital number, since it uses as much as digits as its factorization.

161731828757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63307.

The product of its digits is 3951360, while the sum is 56.

The spelling of 161731828757 in words is "one hundred sixty-one billion, seven hundred thirty-one million, eight hundred twenty-eight thousand, seven hundred fifty-seven".