64121212575 has 144 divisors (see below), whose sum is σ = 138906838560. Its totient is φ = 28909923840.

The previous prime is 64121212549. The next prime is 64121212577. The reversal of 64121212575 is 57521212146.

64121212575 is a `hidden beast` number, since 6 + 41 + 21 + 21 + 2 + 575 = 666.

It is not a de Polignac number, because 64121212575 - 2⁶ = 64121212511 is a prime.

It is a super-2 number, since 2×64121212575² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64121212577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2401197 + ... + 2427753.

Almost surely, 2^64121212575 is an apocalyptic number.

64121212575 is an abundant number, since it is smaller than the sum of its proper divisors (74785625985).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64121212575 is a wasteful number, since it uses less digits than its factorization.

64121212575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26663 (or 26645 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The spelling of 64121212575 in words is "sixty-four billion, one hundred twenty-one million, two hundred twelve thousand, five hundred seventy-five".