638241421441 has 8 divisors (see below), whose sum is σ = 687343208384. Its totient is φ = 589140533520.

The previous prime is 638241421409. The next prime is 638241421553. The reversal of 638241421441 is 144124142836.

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

It is a cyclic number.

It is not a de Polignac number, because 638241421441 - 2⁵ = 638241421409 is a prime.

It is a super-2 number, since 2×638241421441² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638241421394 and 638241421403.

It is not an unprimeable number, because it can be changed into a prime (638241424441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2301250 + ... + 2563636.

It is an arithmetic number, because the mean of its divisors is an integer number (85917901048).

Almost surely, 2^638241421441 is an apocalyptic number.

It is an amenable number.

638241421441 is a deficient number, since it is larger than the sum of its proper divisors (49101786943).

638241421441 is a wasteful number, since it uses less digits than its factorization.

638241421441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449511.

The product of its digits is 147456, while the sum is 40.

The spelling of 638241421441 in words is "six hundred thirty-eight billion, two hundred forty-one million, four hundred twenty-one thousand, four hundred forty-one".