641726054991 has 48 divisors (see below), whose sum is σ = 1061591851008. Its totient is φ = 365927976000.

The previous prime is 641726054917. The next prime is 641726055031. The reversal of 641726054991 is 199450627146.

641726054991 is a `hidden beast` number, since 6 + 4 + 1 + 7 + 2 + 6 + 0 + 549 + 91 = 666.

641726054991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641726054991 - 2¹¹ = 641726052943 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641726054591) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63588856 + ... + 63598946.

It is an arithmetic number, because the mean of its divisors is an integer number (22116496896).

Almost surely, 2^641726054991 is an apocalyptic number.

641726054991 is a deficient number, since it is larger than the sum of its proper divisors (419865796017).

641726054991 is a wasteful number, since it uses less digits than its factorization.

641726054991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12132 (or 12129 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 641726054991 in words is "six hundred forty-one billion, seven hundred twenty-six million, fifty-four thousand, nine hundred ninety-one".