641672820838 has 8 divisors (see below), whose sum is σ = 1100010550032. Its totient is φ = 275002637496.

The previous prime is 641672820821. The next prime is 641672820847. The reversal of 641672820838 is 838028276146.

641672820838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22916886445 + ... + 22916886472.

It is an arithmetic number, because the mean of its divisors is an integer number (137501318754).

Almost surely, 2^641672820838 is an apocalyptic number.

641672820838 is a deficient number, since it is larger than the sum of its proper divisors (458337729194).

641672820838 is a wasteful number, since it uses less digits than its factorization.

641672820838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45833772926.

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 641672820838 in words is "six hundred forty-one billion, six hundred seventy-two million, eight hundred twenty thousand, eight hundred thirty-eight".