64641601 has 4 divisors (see below), whose sum is σ = 64803204. Its totient is φ = 64480000.

The previous prime is 64641593. The next prime is 64641607. The reversal of 64641601 is 10614646.

64641601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 8040²+1.

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 64000000 + 641601 = 8000^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 64641601 - 2³ = 64641593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64641601.

It is not an unprimeable number, because it can be changed into a prime (64641607) 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 3 ways as a sum of consecutive naturals, for example, 80200 + ... + 81001.

It is an arithmetic number, because the mean of its divisors is an integer number (16200801).

Almost surely, 2^64641601 is an apocalyptic number.

It is an amenable number.

64641601 is a deficient number, since it is larger than the sum of its proper divisors (161603).

64641601 is a wasteful number, since it uses less digits than its factorization.

64641601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161602.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 64641601 is about 8040.0000621891. Note that the first 4 decimals coincide. The cubic root of 64641601 is about 401.3322267537.

It can be divided in two parts, 64 and 641601, that multiplied together give a square (41062464 = 6408²).

The spelling of 64641601 in words is "sixty-four million, six hundred forty-one thousand, six hundred one".