641805794038 has 4 divisors (see below), whose sum is σ = 962708691060. Its totient is φ = 320902897018.

The previous prime is 641805794029. The next prime is 641805794039. The reversal of 641805794038 is 830497508146.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 641805794038.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641805794039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160451448508 + ... + 160451448511.

It is an arithmetic number, because the mean of its divisors is an integer number (240677172765).

Almost surely, 2^641805794038 is an apocalyptic number.

641805794038 is a deficient number, since it is larger than the sum of its proper divisors (320902897022).

641805794038 is a wasteful number, since it uses less digits than its factorization.

641805794038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320902897021.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 641805794038 in words is "six hundred forty-one billion, eight hundred five million, seven hundred ninety-four thousand, thirty-eight".