65161000 has 64 divisors (see below), whose sum is σ = 161488080. Its totient is φ = 24524800.

The previous prime is 65160973. The next prime is 65161003. The reversal of 65161000 is 16156.

It can be written as a sum of positive squares in 8 ways, for example, as 2022084 + 63138916 = 1422^2 + 7946^2 .

It is not an unprimeable number, because it can be changed into a prime (65161003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15084 + ... + 18916.

Almost surely, 2^65161000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65161000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80744040).

65161000 is an abundant number, since it is smaller than the sum of its proper divisors (96327080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65161000 is a wasteful number, since it uses less digits than its factorization.

65161000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871 (or 3857 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 65161000 is about 8072.2363691854. The cubic root of 65161000 is about 402.4042697633.

Adding to 65161000 its reverse (16156), we get a palindrome (65177156).

The spelling of 65161000 in words is "sixty-five million, one hundred sixty-one thousand".