161558453 has 16 divisors (see below), whose sum is σ = 191093760. Its totient is φ = 133660800.

The previous prime is 161558437. The next prime is 161558471. The reversal of 161558453 is 354855161.

It is not a de Polignac number, because 161558453 - 2⁴ = 161558437 is a prime.

It is a super-2 number, since 2×161558453² = 52202267471506418, 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 (161558413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112343 + ... + 113771.

It is an arithmetic number, because the mean of its divisors is an integer number (11943360).

Almost surely, 2^161558453 is an apocalyptic number.

It is an amenable number.

161558453 is a deficient number, since it is larger than the sum of its proper divisors (29535307).

161558453 is a wasteful number, since it uses less digits than its factorization.

161558453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988.

The product of its digits is 72000, while the sum is 38.

The square root of 161558453 is about 12710.5646216051. The cubic root of 161558453 is about 544.6404530297.

The spelling of 161558453 in words is "one hundred sixty-one million, five hundred fifty-eight thousand, four hundred fifty-three".