643407622774 has 128 divisors (see below), whose sum is σ = 1195900028928. Its totient is φ = 253382277120.

The previous prime is 643407622769. The next prime is 643407622853. The reversal of 643407622774 is 477226704346.

643407622774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1155130104 + ... + 1155130660.

It is an arithmetic number, because the mean of its divisors is an integer number (9342968976).

Almost surely, 2^643407622774 is an apocalyptic number.

643407622774 is a deficient number, since it is larger than the sum of its proper divisors (552492406154).

643407622774 is a wasteful number, since it uses less digits than its factorization.

643407622774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198.

The product of its (nonzero) digits is 9483264, while the sum is 52.

The spelling of 643407622774 in words is "six hundred forty-three billion, four hundred seven million, six hundred twenty-two thousand, seven hundred seventy-four".