64501260021 has 48 divisors (see below), whose sum is σ = 108494830080. Its totient is φ = 36512532000.

The previous prime is 64501260001. The next prime is 64501260023. The reversal of 64501260021 is 12006210546.

64501260021 is a `hidden beast` number, since 6 + 4 + 50 + 1 + 2 + 600 + 2 + 1 = 666.

It is not a de Polignac number, because 64501260021 - 2¹¹ = 64501257973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64501260023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107935 + ... + 375036.

It is an arithmetic number, because the mean of its divisors is an integer number (2260308960).

Almost surely, 2^64501260021 is an apocalyptic number.

It is an amenable number.

64501260021 is a deficient number, since it is larger than the sum of its proper divisors (43993570059).

64501260021 is a wasteful number, since it uses less digits than its factorization.

64501260021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483078 (or 483075 counting only the distinct ones).

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

Adding to 64501260021 its reverse (12006210546), we get a palindrome (76507470567).

The spelling of 64501260021 in words is "sixty-four billion, five hundred one million, two hundred sixty thousand, twenty-one".