161782523743 has 4 divisors (see below), whose sum is σ = 161785906408. Its totient is φ = 161779141080.

The previous prime is 161782523737. The next prime is 161782523761. The reversal of 161782523743 is 347325287161.

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

It is a cyclic number.

It is not a de Polignac number, because 161782523743 - 2¹³ = 161782515551 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 (161782523783) 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, 1618548 + ... + 1715593.

It is an arithmetic number, because the mean of its divisors is an integer number (40446476602).

Almost surely, 2^161782523743 is an apocalyptic number.

161782523743 is a deficient number, since it is larger than the sum of its proper divisors (3382665).

161782523743 is an equidigital number, since it uses as much as digits as its factorization.

161782523743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382664.

The product of its digits is 1693440, while the sum is 49.

The spelling of 161782523743 in words is "one hundred sixty-one billion, seven hundred eighty-two million, five hundred twenty-three thousand, seven hundred forty-three".