643401006764 has 24 divisors (see below), whose sum is σ = 1128836436000. Its totient is φ = 320876496000.

The previous prime is 643401006757. The next prime is 643401006779. The reversal of 643401006764 is 467600104346.

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, 18631514 + ... + 18666014.

It is an arithmetic number, because the mean of its divisors is an integer number (47034851500).

Almost surely, 2^643401006764 is an apocalyptic number.

It is an amenable number.

643401006764 is a deficient number, since it is larger than the sum of its proper divisors (485435429236).

643401006764 is a wasteful number, since it uses less digits than its factorization.

643401006764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46313 (or 46311 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 643401006764 in words is "six hundred forty-three billion, four hundred one million, six thousand, seven hundred sixty-four".