641641939677 has 6 divisors (see below), whose sum is σ = 926816135102. Its totient is φ = 427761293112.

The previous prime is 641641939643. The next prime is 641641939681. The reversal of 641641939677 is 776939146146.

641641939677 is a `hidden beast` number, since 6 + 4 + 164 + 19 + 396 + 77 = 666.

641641939677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 542600184996 + 99041754681 = 736614^2 + 314709^2 .

It is not a de Polignac number, because 641641939677 - 2¹⁶ = 641641874141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641641939577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35646774418 + ... + 35646774435.

Almost surely, 2^641641939677 is an apocalyptic number.

It is an amenable number.

641641939677 is a deficient number, since it is larger than the sum of its proper divisors (285174195425).

641641939677 is a wasteful number, since it uses less digits than its factorization.

641641939677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71293548859 (or 71293548856 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 63.

The spelling of 641641939677 in words is "six hundred forty-one billion, six hundred forty-one million, nine hundred thirty-nine thousand, six hundred seventy-seven".