64121043859 has 4 divisors (see below), whose sum is σ = 65684971800. Its totient is φ = 62557115920.

The previous prime is 64121043823. The next prime is 64121043913. The reversal of 64121043859 is 95834012146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64121043859 is a prime.

It is a super-2 number, since 2×64121043859² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64121043359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781963909 + ... + 781963990.

It is an arithmetic number, because the mean of its divisors is an integer number (16421242950).

Almost surely, 2^64121043859 is an apocalyptic number.

64121043859 is a deficient number, since it is larger than the sum of its proper divisors (1563927941).

64121043859 is a wasteful number, since it uses less digits than its factorization.

64121043859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563927940.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 64121043859 in words is "sixty-four billion, one hundred twenty-one million, forty-three thousand, eight hundred fifty-nine".