64641501 has 12 divisors (see below), whose sum is σ = 94421340. Its totient is φ = 42609600.

The previous prime is 64641481. The next prime is 64641509. The reversal of 64641501 is 10514646.

64641501 is a `hidden beast` number, since 646 + 4 + 15 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 29713401 + 34928100 = 5451^2 + 5910^2 .

It is not a de Polignac number, because 64641501 - 2¹⁴ = 64625117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39550 + ... + 41151.

It is an arithmetic number, because the mean of its divisors is an integer number (7868445).

Almost surely, 2^64641501 is an apocalyptic number.

It is an amenable number.

64641501 is a deficient number, since it is larger than the sum of its proper divisors (29779839).

64641501 is a wasteful number, since it uses less digits than its factorization.

64641501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80796 (or 80793 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 64641501 is about 8039.9938432812. The cubic root of 64641501 is about 401.3320198011.

The spelling of 64641501 in words is "sixty-four million, six hundred forty-one thousand, five hundred one".