64556161 has 4 divisors (see below), whose sum is σ = 64929492. Its totient is φ = 64182832.

The previous prime is 64556159. The next prime is 64556183. The reversal of 64556161 is 16165546.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16165546 = 2 ⋅8082773.

It can be written as a sum of positive squares in 2 ways, for example, as 49617936 + 14938225 = 7044^2 + 3865^2 .

It is a cyclic number.

It is not a de Polignac number, because 64556161 - 2¹ = 64556159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64556131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186406 + ... + 186751.

It is an arithmetic number, because the mean of its divisors is an integer number (16232373).

Almost surely, 2^64556161 is an apocalyptic number.

It is an amenable number.

64556161 is a deficient number, since it is larger than the sum of its proper divisors (373331).

64556161 is a wasteful number, since it uses less digits than its factorization.

64556161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373330.

The product of its digits is 21600, while the sum is 34.

The square root of 64556161 is about 8034.6848724763. The cubic root of 64556161 is about 401.1553285770.

The spelling of 64556161 in words is "sixty-four million, five hundred fifty-six thousand, one hundred sixty-one".