161776543715623 has 8 divisors (see below), whose sum is σ = 165221540001792. Its totient is φ = 158331670019736.

The previous prime is 161776543715599. The next prime is 161776543715659. The reversal of 161776543715623 is 326517345677161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161776543715623 is a prime.

It is a super-3 number, since 3×161776543715623³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161776543715663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27977715 + ... + 33261172.

It is an arithmetic number, because the mean of its divisors is an integer number (20652692500224).

Almost surely, 2^{161776543715623} is an apocalyptic number.

161776543715623 is a deficient number, since it is larger than the sum of its proper divisors (3444996286169).

161776543715623 is an equidigital number, since it uses as much as digits as its factorization.

161776543715623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61295141.

The product of its digits is 133358400, while the sum is 64.

The spelling of 161776543715623 in words is "one hundred sixty-one trillion, seven hundred seventy-six billion, five hundred forty-three million, seven hundred fifteen thousand, six hundred twenty-three".