161207705623 has 4 divisors (see below), whose sum is σ = 161210323008. Its totient is φ = 161205088240.

The previous prime is 161207705611. The next prime is 161207705657. The reversal of 161207705623 is 326507702161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326507702161 = 10733 ⋅30420917.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161207705623 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161207705683) 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, 1214023 + ... + 1340248.

It is an arithmetic number, because the mean of its divisors is an integer number (40302580752).

Almost surely, 2^161207705623 is an apocalyptic number.

161207705623 is a deficient number, since it is larger than the sum of its proper divisors (2617385).

161207705623 is an equidigital number, since it uses as much as digits as its factorization.

161207705623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617384.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 161207705623 in words is "one hundred sixty-one billion, two hundred seven million, seven hundred five thousand, six hundred twenty-three".