641238332887 has 4 divisors (see below), whose sum is σ = 642837431376. Its totient is φ = 639639234400.

The previous prime is 641238332881. The next prime is 641238332941. The reversal of 641238332887 is 788233832146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788233832146 = 2 ⋅394116916073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641238332887 is a prime.

It is a super-2 number, since 2×641238332887² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641238332881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799548643 + ... + 799549444.

It is an arithmetic number, because the mean of its divisors is an integer number (160709357844).

Almost surely, 2^641238332887 is an apocalyptic number.

641238332887 is a deficient number, since it is larger than the sum of its proper divisors (1599098489).

641238332887 is a wasteful number, since it uses less digits than its factorization.

641238332887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599098488.

The product of its digits is 9289728, while the sum is 55.

The spelling of 641238332887 in words is "six hundred forty-one billion, two hundred thirty-eight million, three hundred thirty-two thousand, eight hundred eighty-seven".