64121043858 has 32 divisors (see below), whose sum is σ = 136186315200. Its totient is φ = 20069554176.

The previous prime is 64121043823. The next prime is 64121043913. The reversal of 64121043858 is 85834012146.

It is a happy number.

It is a super-2 number, since 2×64121043858² (a number of 22 digits) contains 22 as substring.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 2475903 + ... + 2501666.

It is an arithmetic number, because the mean of its divisors is an integer number (4255822350).

Almost surely, 2^64121043858 is an apocalyptic number.

64121043858 is an abundant number, since it is smaller than the sum of its proper divisors (72065271342).

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

64121043858 is a wasteful number, since it uses less digits than its factorization.

64121043858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977706.

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 64121043858 in words is "sixty-four billion, one hundred twenty-one million, forty-three thousand, eight hundred fifty-eight".