638374640127 has 8 divisors (see below), whose sum is σ = 972761356416. Its totient is φ = 364785508632.

The previous prime is 638374640083. The next prime is 638374640131. The reversal of 638374640127 is 721046473836.

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

It is not a de Polignac number, because 638374640127 - 2¹⁹ = 638374115839 is a prime.

It is a super-2 number, since 2×638374640127² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638374640127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638374640177) 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, 15199396173 + ... + 15199396214.

It is an arithmetic number, because the mean of its divisors is an integer number (121595169552).

Almost surely, 2^638374640127 is an apocalyptic number.

638374640127 is a deficient number, since it is larger than the sum of its proper divisors (334386716289).

638374640127 is a wasteful number, since it uses less digits than its factorization.

638374640127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30398792397.

The product of its (nonzero) digits is 4064256, while the sum is 51.

The spelling of 638374640127 in words is "six hundred thirty-eight billion, three hundred seventy-four million, six hundred forty thousand, one hundred twenty-seven".