161653 has 8 divisors (see below), whose sum is σ = 176472. Its totient is φ = 147456.

The previous prime is 161641. The next prime is 161659. The reversal of 161653 is 356161.

It can be written as a sum of positive squares in 4 ways, for example, as 128164 + 33489 = 358^2 + 183^2 .

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

It is a 7-Lehmer number, since φ(161653) divides (161653-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 161653 - 2⁹ = 161141 is a prime.

It is a super-2 number, since 2×161653² = 52263384818, 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 (161659) 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, 501 + ... + 757.

It is an arithmetic number, because the mean of its divisors is an integer number (22059).

2¹⁶¹⁶⁵³ is an apocalyptic number.

It is an amenable number.

161653 is a deficient number, since it is larger than the sum of its proper divisors (14819).

161653 is a wasteful number, since it uses less digits than its factorization.

161653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its digits is 540, while the sum is 22.

The square root of 161653 is about 402.0609406545. The cubic root of 161653 is about 54.4746676872.

The spelling of 161653 in words is "one hundred sixty-one thousand, six hundred fifty-three".