641880137638 has 8 divisors (see below), whose sum is σ = 962849873880. Its totient is φ = 320930179680.

The previous prime is 641880137617. The next prime is 641880137671. The reversal of 641880137638 is 836731088146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×641880137638² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4863168 + ... + 4993411.

It is an arithmetic number, because the mean of its divisors is an integer number (120356234235).

Almost surely, 2^641880137638 is an apocalyptic number.

641880137638 is a deficient number, since it is larger than the sum of its proper divisors (320969736242).

641880137638 is a wasteful number, since it uses less digits than its factorization.

641880137638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9889142.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 641880137638 in words is "six hundred forty-one billion, eight hundred eighty million, one hundred thirty-seven thousand, six hundred thirty-eight".