161658583 has 4 divisors (see below), whose sum is σ = 166873408. Its totient is φ = 156443760.

The previous prime is 161658571. The next prime is 161658589. The reversal of 161658583 is 385856161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 385856161 = 19 ⋅20308219.

It is a cyclic number.

It is not a de Polignac number, because 161658583 - 2⁹ = 161658071 is a prime.

It is a super-2 number, since 2×161658583² = 52266994915135778, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161658589) 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, 2607366 + ... + 2607427.

It is an arithmetic number, because the mean of its divisors is an integer number (41718352).

Almost surely, 2^161658583 is an apocalyptic number.

161658583 is a deficient number, since it is larger than the sum of its proper divisors (5214825).

161658583 is an equidigital number, since it uses as much as digits as its factorization.

161658583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5214824.

The product of its digits is 172800, while the sum is 43.

The square root of 161658583 is about 12714.5028609065. The cubic root of 161658583 is about 544.7529480946.

The spelling of 161658583 in words is "one hundred sixty-one million, six hundred fifty-eight thousand, five hundred eighty-three".