161567174989 has 6 divisors (see below), whose sum is σ = 177590366030. Its totient is φ = 146879249880.

The previous prime is 161567174987. The next prime is 161567175019. The reversal of 161567174989 is 989471765161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 161511553225 + 55621764 = 401885^2 + 7458^2 .

It is not a de Polignac number, because 161567174989 - 2¹ = 161567174987 is a prime.

It is a super-2 number, since 2×161567174989² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161567174989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161567174981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667632834 + ... + 667633075.

Almost surely, 2^161567174989 is an apocalyptic number.

It is an amenable number.

161567174989 is a deficient number, since it is larger than the sum of its proper divisors (16023191041).

161567174989 is a wasteful number, since it uses less digits than its factorization.

161567174989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335265931 (or 1335265920 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 64.

The spelling of 161567174989 in words is "one hundred sixty-one billion, five hundred sixty-seven million, one hundred seventy-four thousand, nine hundred eighty-nine".