64121043860 has 12 divisors (see below), whose sum is σ = 134654192148. Its totient is φ = 25648417536.

The previous prime is 64121043823. The next prime is 64121043913. The reversal of 64121043860 is 6834012146.

It can be written as a sum of positive squares in 2 ways, for example, as 25188229264 + 38932814596 = 158708^2 + 197314^2 .

It is a super-2 number, since 2×64121043860² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64121043860.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1603026077 + ... + 1603026116.

It is an arithmetic number, because the mean of its divisors is an integer number (11221182679).

Almost surely, 2^64121043860 is an apocalyptic number.

It is an amenable number.

64121043860 is an abundant number, since it is smaller than the sum of its proper divisors (70533148288).

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

64121043860 is a wasteful number, since it uses less digits than its factorization.

64121043860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206052202 (or 3206052200 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 64121043860 in words is "sixty-four billion, one hundred twenty-one million, forty-three thousand, eight hundred sixty".