161577423 has 20 divisors (see below), whose sum is σ = 275850960. Its totient is φ = 92329632.

The previous prime is 161577421. The next prime is 161577431. The reversal of 161577423 is 324775161.

It is a happy number.

161577423 is a `hidden beast` number, since 1 + 61 + 577 + 4 + 23 = 666.

It is not a de Polignac number, because 161577423 - 2¹ = 161577421 is a prime.

It is a super-2 number, since 2×161577423² = 52214527246641858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161577421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 141918 + ... + 143051.

It is an arithmetic number, because the mean of its divisors is an integer number (13792548).

Almost surely, 2^161577423 is an apocalyptic number.

161577423 is a deficient number, since it is larger than the sum of its proper divisors (114273537).

161577423 is an equidigital number, since it uses as much as digits as its factorization.

161577423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284988 (or 284979 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 161577423 is about 12711.3108293362. The cubic root of 161577423 is about 544.6617692053.

The spelling of 161577423 in words is "one hundred sixty-one million, five hundred seventy-seven thousand, four hundred twenty-three".