641442611990 has 8 divisors (see below), whose sum is σ = 1154596701600. Its totient is φ = 256577044792.

The previous prime is 641442611959. The next prime is 641442612017. The reversal of 641442611990 is 99116244146.

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

It is a super-2 number, since 2×641442611990² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 32072130590 + ... + 32072130609.

It is an arithmetic number, because the mean of its divisors is an integer number (144324587700).

Almost surely, 2^641442611990 is an apocalyptic number.

641442611990 is a deficient number, since it is larger than the sum of its proper divisors (513154089610).

641442611990 is a wasteful number, since it uses less digits than its factorization.

641442611990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64144261206.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 641442611990 in words is "six hundred forty-one billion, four hundred forty-two million, six hundred eleven thousand, nine hundred ninety".