638374481141 has 4 divisors (see below), whose sum is σ = 638376408192. Its totient is φ = 638372554092.

The previous prime is 638374481137. The next prime is 638374481149. The reversal of 638374481141 is 141184473836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638374481141 - 2² = 638374481137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 638374481141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638374481149) 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, 326021 + ... + 1176026.

It is an arithmetic number, because the mean of its divisors is an integer number (159594102048).

Almost surely, 2^638374481141 is an apocalyptic number.

It is an amenable number.

638374481141 is a deficient number, since it is larger than the sum of its proper divisors (1927051).

638374481141 is a wasteful number, since it uses less digits than its factorization.

638374481141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927050.

The product of its digits is 1548288, while the sum is 50.

The spelling of 638374481141 in words is "six hundred thirty-eight billion, three hundred seventy-four million, four hundred eighty-one thousand, one hundred forty-one".