161657453 has 4 divisors (see below), whose sum is σ = 170165760. Its totient is φ = 153149148.

The previous prime is 161657413. The next prime is 161657549. The reversal of 161657453 is 354756161.

161657453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161657453 - 2⁶ = 161657389 is a prime.

It is a super-2 number, since 2×161657453² = 52266264220894418, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161657413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4254125 + ... + 4254162.

It is an arithmetic number, because the mean of its divisors is an integer number (42541440).

Almost surely, 2^161657453 is an apocalyptic number.

It is an amenable number.

161657453 is a deficient number, since it is larger than the sum of its proper divisors (8508307).

161657453 is an equidigital number, since it uses as much as digits as its factorization.

161657453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8508306.

The product of its digits is 75600, while the sum is 38.

The square root of 161657453 is about 12714.4584233856. The cubic root of 161657453 is about 544.7516788100.

The spelling of 161657453 in words is "one hundred sixty-one million, six hundred fifty-seven thousand, four hundred fifty-three".