641255444990 has 16 divisors (see below), whose sum is σ = 1154285579520. Its totient is φ = 256496449440.

The previous prime is 641255444989. The next prime is 641255445079. The reversal of 641255444990 is 99444552146.

It is a super-2 number, since 2×641255444990² (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 (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230225 + ... + 1155644.

It is an arithmetic number, because the mean of its divisors is an integer number (72142848720).

Almost surely, 2^641255444990 is an apocalyptic number.

641255444990 is a deficient number, since it is larger than the sum of its proper divisors (513030134530).

641255444990 is a wasteful number, since it uses less digits than its factorization.

641255444990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432147.

The product of its (nonzero) digits is 6220800, while the sum is 53.

The spelling of 641255444990 in words is "six hundred forty-one billion, two hundred fifty-five million, four hundred forty-four thousand, nine hundred ninety".