643265154456 has 64 divisors (see below), whose sum is σ = 1648624665600. Its totient is φ = 209061512448.

The previous prime is 643265154407. The next prime is 643265154473. The reversal of 643265154456 is 654451562346.

643265154456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643265154399 and 643265154408.

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, 787501 + ... + 1380828.

It is an arithmetic number, because the mean of its divisors is an integer number (25759760400).

Almost surely, 2^643265154456 is an apocalyptic number.

It is an amenable number.

643265154456 is an abundant number, since it is smaller than the sum of its proper divisors (1005359511144).

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

643265154456 is a wasteful number, since it uses less digits than its factorization.

643265154456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168648 (or 2168644 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 51.

The spelling of 643265154456 in words is "six hundred forty-three billion, two hundred sixty-five million, one hundred fifty-four thousand, four hundred fifty-six".