641450420836 has 45 divisors (see below), whose sum is σ = 1175114848089. Its totient is φ = 306375377616.

The previous prime is 641450420803. The next prime is 641450420887. The reversal of 641450420836 is 638024054146.

The square root of 641450420836 is 800906.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 396282840100 + 245167580736 = 629510^2 + 495144^2 .

It is a super-2 number, since 2×641450420836² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641450420792 and 641450420801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 847358170 + ... + 847358926.

Almost surely, 2^641450420836 is an apocalyptic number.

641450420836 is the 800906-th square number.

It is an amenable number.

641450420836 is a deficient number, since it is larger than the sum of its proper divisors (533664427253).

641450420836 is an frugal number, since it uses more digits than its factorization.

641450420836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 641450420836 in words is "six hundred forty-one billion, four hundred fifty million, four hundred twenty thousand, eight hundred thirty-six".