64536161 has 4 divisors (see below), whose sum is σ = 65420292. Its totient is φ = 63652032.

The previous prime is 64536119. The next prime is 64536167. The reversal of 64536161 is 16163546.

64536161 = 5680² + 5681².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32273761 + 32262400 = 5681^2 + 5680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64536161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64536167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441956 + ... + 442101.

It is an arithmetic number, because the mean of its divisors is an integer number (16355073).

Almost surely, 2^64536161 is an apocalyptic number.

64536161 is the 5681-st centered square number.

It is an amenable number.

64536161 is a deficient number, since it is larger than the sum of its proper divisors (884131).

64536161 is an equidigital number, since it uses as much as digits as its factorization.

64536161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884130.

The product of its digits is 12960, while the sum is 32.

The square root of 64536161 is about 8033.4401721803. The cubic root of 64536161 is about 401.1138972861.

The spelling of 64536161 in words is "sixty-four million, five hundred thirty-six thousand, one hundred sixty-one".