64756161 has 12 divisors (see below), whose sum is σ = 98459920. Its totient is φ = 40898520.

The previous prime is 64756141. The next prime is 64756163. The reversal of 64756161 is 16165746.

64756161 is a `hidden beast` number, since 647 + 5 + 6 + 1 + 6 + 1 = 666.

64756161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64756161 - 2¹⁰ = 64755137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64756163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189175 + ... + 189516.

Almost surely, 2^64756161 is an apocalyptic number.

It is an amenable number.

64756161 is a deficient number, since it is larger than the sum of its proper divisors (33703759).

64756161 is a wasteful number, since it uses less digits than its factorization.

64756161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378716 (or 378713 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 64756161 is about 8047.1212865223. The cubic root of 64756161 is about 401.5691716182.

Adding to 64756161 its product of digits (30240), we get a square (64786401 = 8049²).

The spelling of 64756161 in words is "sixty-four million, seven hundred fifty-six thousand, one hundred sixty-one".