161774874895 has 4 divisors (see below), whose sum is σ = 194129849880. Its totient is φ = 129419899912.

The previous prime is 161774874851. The next prime is 161774874907. The reversal of 161774874895 is 598478477161.

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 161774874895 - 2¹³ = 161774866703 is a prime.

It is a super-2 number, since 2×161774874895² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 161774874895.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16177487485 + ... + 16177487494.

It is an arithmetic number, because the mean of its divisors is an integer number (48532462470).

Almost surely, 2^161774874895 is an apocalyptic number.

161774874895 is a deficient number, since it is larger than the sum of its proper divisors (32354974985).

161774874895 is an equidigital number, since it uses as much as digits as its factorization.

161774874895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32354974984.

The product of its digits is 94832640, while the sum is 67.

The spelling of 161774874895 in words is "one hundred sixty-one billion, seven hundred seventy-four million, eight hundred seventy-four thousand, eight hundred ninety-five".