6501358161 has 75 divisors (see below), whose sum is σ = 10662497373. Its totient is φ = 3947693760.

The previous prime is 6501358133. The next prime is 6501358177. The reversal of 6501358161 is 1618531056.

The square root of 6501358161 is 80631.

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

6501358161 is a `hidden beast` number, since 6 + 5 + 0 + 13 + 581 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2017716561 + 4483641600 = 44919^2 + 66960^2 .

It is not a de Polignac number, because 6501358161 - 2¹³ = 6501349969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6501358111) by changing a digit.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 209721216 + ... + 209721246.

Almost surely, 2^6501358161 is an apocalyptic number.

6501358161 is the 80631-st square number.

6501358161 is the 40316-th centered octagonal number.

It is an amenable number.

6501358161 is a deficient number, since it is larger than the sum of its proper divisors (4161139212).

6501358161 is an frugal number, since it uses more digits than its factorization.

6501358161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The cubic root of 6501358161 is about 1866.3855527176.

Multiplying 6501358161 by its sum of digits (36), we get a square (234048893796 = 483786²).

The spelling of 6501358161 in words is "six billion, five hundred one million, three hundred fifty-eight thousand, one hundred sixty-one".