638263251325 has 24 divisors (see below), whose sum is σ = 905141763648. Its totient is φ = 437360638080.

The previous prime is 638263251323. The next prime is 638263251337. The reversal of 638263251325 is 523152362836.

It is a happy number.

It is not a de Polignac number, because 638263251325 - 2¹ = 638263251323 is a prime.

It is a super-2 number, since 2×638263251325² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638263251323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1021807 + ... + 1523356.

It is an arithmetic number, because the mean of its divisors is an integer number (37714240152).

Almost surely, 2^638263251325 is an apocalyptic number.

It is an amenable number.

638263251325 is a deficient number, since it is larger than the sum of its proper divisors (266878512323).

638263251325 is a wasteful number, since it uses less digits than its factorization.

638263251325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546613 (or 2546608 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 46.

The spelling of 638263251325 in words is "six hundred thirty-eight billion, two hundred sixty-three million, two hundred fifty-one thousand, three hundred twenty-five".