161807653 has 6 divisors (see below), whose sum is σ = 188225286. Its totient is φ = 138692232.

The previous prime is 161807621. The next prime is 161807669. The reversal of 161807653 is 356708161.

It can be written as a sum of positive squares in only one way, i.e., 150234049 + 11573604 = 12257^2 + 3402^2 .

It is not a de Polignac number, because 161807653 - 2⁵ = 161807621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161807603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1651050 + ... + 1651147.

It is an arithmetic number, because the mean of its divisors is an integer number (31370881).

Almost surely, 2^161807653 is an apocalyptic number.

It is an amenable number.

161807653 is a deficient number, since it is larger than the sum of its proper divisors (26417633).

161807653 is an equidigital number, since it uses as much as digits as its factorization.

161807653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302211 (or 3302204 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 161807653 is about 12720.3637133535. The cubic root of 161807653 is about 544.9203407406.

The spelling of 161807653 in words is "one hundred sixty-one million, eight hundred seven thousand, six hundred fifty-three".