643294411876 has 6 divisors (see below), whose sum is σ = 1125765220790. Its totient is φ = 321647205936.

The previous prime is 643294411763. The next prime is 643294411897. The reversal of 643294411876 is 678114492346.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 388091620900 + 255202790976 = 622970^2 + 505176^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80411801481 + ... + 80411801488.

Almost surely, 2^643294411876 is an apocalyptic number.

It is an amenable number.

643294411876 is a deficient number, since it is larger than the sum of its proper divisors (482470808914).

643294411876 is a wasteful number, since it uses less digits than its factorization.

643294411876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160823602973 (or 160823602971 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 55.

The spelling of 643294411876 in words is "six hundred forty-three billion, two hundred ninety-four million, four hundred eleven thousand, eight hundred seventy-six".