641651345556 has 72 divisors (see below), whose sum is σ = 1627942022784. Its totient is φ = 196611816960.

The previous prime is 641651345551. The next prime is 641651345581. The reversal of 641651345556 is 655543156146.

It is a junction number, because it is equal to n+sod(n) for n = 641651345499 and 641651345508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641651345551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167676 + ... + 1145171.

It is an arithmetic number, because the mean of its divisors is an integer number (22610305872).

Almost surely, 2^641651345556 is an apocalyptic number.

It is an amenable number.

641651345556 is an abundant number, since it is smaller than the sum of its proper divisors (986290677228).

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

641651345556 is a wasteful number, since it uses less digits than its factorization.

641651345556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313121 (or 1313106 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 51.

The spelling of 641651345556 in words is "six hundred forty-one billion, six hundred fifty-one million, three hundred forty-five thousand, five hundred fifty-six".