638251319445 has 16 divisors (see below), whose sum is σ = 1030239300672. Its totient is φ = 337388307200.

The previous prime is 638251319443. The next prime is 638251319449. The reversal of 638251319445 is 544913152836.

It is not a de Polignac number, because 638251319445 - 2¹ = 638251319443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638251319443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188273031 + ... + 188276420.

It is an arithmetic number, because the mean of its divisors is an integer number (64389956292).

Almost surely, 2^638251319445 is an apocalyptic number.

It is an amenable number.

638251319445 is a deficient number, since it is larger than the sum of its proper divisors (391987981227).

638251319445 is a wasteful number, since it uses less digits than its factorization.

638251319445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376549572.

The product of its digits is 3110400, while the sum is 51.

The spelling of 638251319445 in words is "six hundred thirty-eight billion, two hundred fifty-one million, three hundred nineteen thousand, four hundred forty-five".