643537070076 has 48 divisors (see below), whose sum is σ = 1567086200064. Its totient is φ = 205157796096.

The previous prime is 643537070063. The next prime is 643537070123. The reversal of 643537070076 is 670070735346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1921380 + ... + 2231316.

It is an arithmetic number, because the mean of its divisors is an integer number (32647629168).

Almost surely, 2^643537070076 is an apocalyptic number.

It is an amenable number.

643537070076 is an abundant number, since it is smaller than the sum of its proper divisors (923549129988).

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

643537070076 is a wasteful number, since it uses less digits than its factorization.

643537070076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317490 (or 317488 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 48.

The spelling of 643537070076 in words is "six hundred forty-three billion, five hundred thirty-seven million, seventy thousand, seventy-six".