643347423368 has 32 divisors (see below), whose sum is σ = 1299107107200. Its totient is φ = 296920392768.

The previous prime is 643347423307. The next prime is 643347423379. The reversal of 643347423368 is 863324743346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4207505 + ... + 4357727.

It is an arithmetic number, because the mean of its divisors is an integer number (40597097100).

Almost surely, 2^643347423368 is an apocalyptic number.

It is an amenable number.

643347423368 is an abundant number, since it is smaller than the sum of its proper divisors (655759683832).

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

643347423368 is a wasteful number, since it uses less digits than its factorization.

643347423368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191421 (or 191417 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 53.

The spelling of 643347423368 in words is "six hundred forty-three billion, three hundred forty-seven million, four hundred twenty-three thousand, three hundred sixty-eight".