64123940871 has 20 divisors (see below), whose sum is σ = 98379010312. Its totient is φ = 41593905648.

The previous prime is 64123940801. The next prime is 64123940873. The reversal of 64123940871 is 17804932146.

64123940871 is a `hidden beast` number, since 6 + 4 + 1 + 239 + 408 + 7 + 1 = 666.

64123940871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64123940871 - 2⁷ = 64123940743 is a prime.

It is a super-2 number, since 2×64123940871² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64123940873) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10695025 + ... + 10701018.

Almost surely, 2^64123940871 is an apocalyptic number.

64123940871 is a deficient number, since it is larger than the sum of its proper divisors (34255069441).

64123940871 is a wasteful number, since it uses less digits than its factorization.

64123940871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21396092 (or 21396083 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 64123940871 in words is "sixty-four billion, one hundred twenty-three million, nine hundred forty thousand, eight hundred seventy-one".