641833701956 has 6 divisors (see below), whose sum is σ = 1123208978430. Its totient is φ = 320916850976.

The previous prime is 641833701941. The next prime is 641833701973. The reversal of 641833701956 is 659107338146.

It can be written as a sum of positive squares in only one way, i.e., 343079632900 + 298754069056 = 585730^2 + 546584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 641833701898 and 641833701907.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80229212741 + ... + 80229212748.

It is an arithmetic number, because the mean of its divisors is an integer number (187201496405).

Almost surely, 2^641833701956 is an apocalyptic number.

It is an amenable number.

641833701956 is a deficient number, since it is larger than the sum of its proper divisors (481375276474).

641833701956 is a wasteful number, since it uses less digits than its factorization.

641833701956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160458425493 (or 160458425491 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 641833701956 in words is "six hundred forty-one billion, eight hundred thirty-three million, seven hundred one thousand, nine hundred fifty-six".