161641464361 has 12 divisors (see below), whose sum is σ = 185327877852. Its totient is φ = 140430590976.

The previous prime is 161641464349. The next prime is 161641464373. The reversal of 161641464361 is 163464146161.

It is an interprime number because it is at equal distance from previous prime (161641464349) and next prime (161641464373).

It can be written as a sum of positive squares in 6 ways, for example, as 45169425961 + 116472038400 = 212531^2 + 341280^2 .

It is not a de Polignac number, because 161641464361 - 2²⁵ = 161607909929 is a prime.

It is a super-4 number, since 4×161641464361⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (161641464161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28128256 + ... + 28134001.

It is an arithmetic number, because the mean of its divisors is an integer number (15443989821).

Almost surely, 2^161641464361 is an apocalyptic number.

It is an amenable number.

161641464361 is a deficient number, since it is larger than the sum of its proper divisors (23686413491).

161641464361 is a wasteful number, since it uses less digits than its factorization.

161641464361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56262300 (or 56262287 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The spelling of 161641464361 in words is "one hundred sixty-one billion, six hundred forty-one million, four hundred sixty-four thousand, three hundred sixty-one".