643875145127 has 16 divisors (see below), whose sum is σ = 697555152000. Its totient is φ = 592423454304.

The previous prime is 643875144949. The next prime is 643875145217. The reversal of 643875145127 is 721541578346.

It is a cyclic number.

It is not a de Polignac number, because 643875145127 - 2¹⁰ = 643875144103 is a prime.

It is a super-2 number, since 2×643875145127² (a number of 24 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 (643875195127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3367052 + ... + 3553137.

It is an arithmetic number, because the mean of its divisors is an integer number (43597197000).

Almost surely, 2^643875145127 is an apocalyptic number.

643875145127 is a deficient number, since it is larger than the sum of its proper divisors (53680006873).

643875145127 is a wasteful number, since it uses less digits than its factorization.

643875145127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6920350.

The product of its digits is 5644800, while the sum is 53.

The spelling of 643875145127 in words is "six hundred forty-three billion, eight hundred seventy-five million, one hundred forty-five thousand, one hundred twenty-seven".