641387560121 has 16 divisors (see below), whose sum is σ = 800619033600. Its totient is φ = 499178132880.

The previous prime is 641387560117. The next prime is 641387560127. The reversal of 641387560121 is 121065783146.

It is not a de Polignac number, because 641387560121 - 2² = 641387560117 is a prime.

It is a super-2 number, since 2×641387560121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641387560127) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4972421 + ... + 5099778.

It is an arithmetic number, because the mean of its divisors is an integer number (50038689600).

Almost surely, 2^641387560121 is an apocalyptic number.

It is an amenable number.

641387560121 is a deficient number, since it is larger than the sum of its proper divisors (159231473479).

641387560121 is a wasteful number, since it uses less digits than its factorization.

641387560121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10073044.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 641387560121 in words is "six hundred forty-one billion, three hundred eighty-seven million, five hundred sixty thousand, one hundred twenty-one".