161657469 has 12 divisors (see below), whose sum is σ = 235818492. Its totient is φ = 106704000.

The previous prime is 161657413. The next prime is 161657549. The reversal of 161657469 is 964756161.

161657469 is a `hidden beast` number, since 1 + 6 + 16 + 574 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 130988025 + 30669444 = 11445^2 + 5538^2 .

It is not a de Polignac number, because 161657469 - 2¹⁷ = 161526397 is a prime.

It is a super-2 number, since 2×161657469² = 52266274566971922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161657569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88012 + ... + 89829.

It is an arithmetic number, because the mean of its divisors is an integer number (19651541).

Almost surely, 2^161657469 is an apocalyptic number.

It is an amenable number.

161657469 is a deficient number, since it is larger than the sum of its proper divisors (74161023).

161657469 is a wasteful number, since it uses less digits than its factorization.

161657469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177948 (or 177945 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 161657469 is about 12714.4590525905. The cubic root of 161657469 is about 544.7516967822.

The spelling of 161657469 in words is "one hundred sixty-one million, six hundred fifty-seven thousand, four hundred sixty-nine".