2161506064 has 45 divisors (see below), whose sum is σ = 4281837397. Its totient is φ = 1057042112.

The previous prime is 2161506041. The next prime is 2161506103. The reversal of 2161506064 is 4606051612.

The square root of 2161506064 is 46492.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2117840400 + 43665664 = 46020^2 + 6608^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10972014 + ... + 10972210.

Almost surely, 2^2161506064 is an apocalyptic number.

2161506064 is the 46492-nd square number.

It is an amenable number.

2161506064 is a deficient number, since it is larger than the sum of its proper divisors (2120331333).

2161506064 is an frugal number, since it uses more digits than its factorization.

2161506064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The cubic root of 2161506064 is about 1292.9611809349.

Adding to 2161506064 its reverse (4606051612), we get a palindrome (6767557676).

The spelling of 2161506064 in words is "two billion, one hundred sixty-one million, five hundred six thousand, sixty-four".