161166553 has 8 divisors (see below), whose sum is σ = 163636200. Its totient is φ = 158704128.

The previous prime is 161166547. The next prime is 161166559. The reversal of 161166553 is 355661161.

It is an interprime number because it is at equal distance from previous prime (161166547) and next prime (161166559).

It can be written as a sum of positive squares in 4 ways, for example, as 105021504 + 56145049 = 10248^2 + 7493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161166553 - 2¹⁷ = 161035481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161166559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57693 + ... + 60421.

It is an arithmetic number, because the mean of its divisors is an integer number (20454525).

Almost surely, 2^161166553 is an apocalyptic number.

It is an amenable number.

161166553 is a deficient number, since it is larger than the sum of its proper divisors (2469647).

161166553 is an equidigital number, since it uses as much as digits as its factorization.

161166553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611.

The product of its digits is 16200, while the sum is 34.

The square root of 161166553 is about 12695.1389515830. The cubic root of 161166553 is about 544.1997097361.

The spelling of 161166553 in words is "one hundred sixty-one million, one hundred sixty-six thousand, five hundred fifty-three".