64432161 has 12 divisors (see below), whose sum is σ = 93153060. Its totient is φ = 42915840.

The previous prime is 64432157. The next prime is 64432169. The reversal of 64432161 is 16123446.

64432161 is a `hidden beast` number, since 6 + 443 + 216 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3825936 + 60606225 = 1956^2 + 7785^2 .

It is not a de Polignac number, because 64432161 - 2² = 64432157 is a prime.

It is a super-2 number, since 2×64432161² = 8303006742259842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64432169) 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, 10141 + ... + 15221.

It is an arithmetic number, because the mean of its divisors is an integer number (7762755).

Almost surely, 2^64432161 is an apocalyptic number.

It is an amenable number.

64432161 is a deficient number, since it is larger than the sum of its proper divisors (28720899).

64432161 is a wasteful number, since it uses less digits than its factorization.

64432161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6496 (or 6493 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 64432161 is about 8026.9646193315. The cubic root of 64432161 is about 400.8983164752.

The spelling of 64432161 in words is "sixty-four million, four hundred thirty-two thousand, one hundred sixty-one".