641986259993 has 16 divisors (see below), whose sum is σ = 696689212800. Its totient is φ = 588047454720.

The previous prime is 641986259939. The next prime is 641986260029. The reversal of 641986259993 is 399952689146.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641986259993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641986252993) 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, 3597353 + ... + 3771593.

It is an arithmetic number, because the mean of its divisors is an integer number (43543075800).

Almost surely, 2^641986259993 is an apocalyptic number.

It is an amenable number.

641986259993 is a deficient number, since it is larger than the sum of its proper divisors (54702952807).

641986259993 is a wasteful number, since it uses less digits than its factorization.

641986259993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176432.

The product of its digits is 226748160, while the sum is 71.

The spelling of 641986259993 in words is "six hundred forty-one billion, nine hundred eighty-six million, two hundred fifty-nine thousand, nine hundred ninety-three".