64641065525 has 36 divisors (see below), whose sum is σ = 82802512800. Its totient is φ = 50057092800.

The previous prime is 64641065521. The next prime is 64641065551. The reversal of 64641065525 is 52556014646.

It is not a de Polignac number, because 64641065525 - 2² = 64641065521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641065521) 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 35 ways as a sum of consecutive naturals, for example, 6806030 + ... + 6815520.

It is an arithmetic number, because the mean of its divisors is an integer number (2300069800).

Almost surely, 2^64641065525 is an apocalyptic number.

It is an amenable number.

64641065525 is a deficient number, since it is larger than the sum of its proper divisors (18161447275).

64641065525 is a wasteful number, since it uses less digits than its factorization.

64641065525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9774 (or 9732 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 64641065525 in words is "sixty-four billion, six hundred forty-one million, sixty-five thousand, five hundred twenty-five".