641920100613 has 16 divisors (see below), whose sum is σ = 933716077056. Its totient is φ = 389036605040.

The previous prime is 641920100611. The next prime is 641920100629. The reversal of 641920100613 is 316001029146.

641920100613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 641920100613 - 2¹ = 641920100611 is a prime.

It is a super-2 number, since 2×641920100613² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641920100611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3221320 + ... + 3414782.

It is an arithmetic number, because the mean of its divisors is an integer number (58357254816).

Almost surely, 2^641920100613 is an apocalyptic number.

It is an amenable number.

641920100613 is a deficient number, since it is larger than the sum of its proper divisors (291795976443).

641920100613 is a wasteful number, since it uses less digits than its factorization.

641920100613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294024.

The product of its (nonzero) digits is 7776, while the sum is 33.

Adding to 641920100613 its reverse (316001029146), we get a palindrome (957921129759).

The spelling of 641920100613 in words is "six hundred forty-one billion, nine hundred twenty million, one hundred thousand, six hundred thirteen".