161586623 has 4 divisors (see below), whose sum is σ = 176276328. Its totient is φ = 146896920.

The previous prime is 161586613. The next prime is 161586673. The reversal of 161586623 is 326685161.

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 161586623 - 2⁸ = 161586367 is a prime.

It is a super-2 number, since 2×161586623² = 52220473465088258, which contains 22 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 (161586613) by changing a digit.

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, 7344836 + ... + 7344857.

It is an arithmetic number, because the mean of its divisors is an integer number (44069082).

Almost surely, 2^161586623 is an apocalyptic number.

161586623 is a deficient number, since it is larger than the sum of its proper divisors (14689705).

161586623 is a wasteful number, since it uses less digits than its factorization.

161586623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14689704.

The product of its digits is 51840, while the sum is 38.

The square root of 161586623 is about 12711.6727066110. The cubic root of 161586623 is about 544.6721064440.

The spelling of 161586623 in words is "one hundred sixty-one million, five hundred eighty-six thousand, six hundred twenty-three".