638376753381 has 32 divisors (see below), whose sum is σ = 858445406208. Its totient is φ = 421967010240.

The previous prime is 638376753361. The next prime is 638376753383. The reversal of 638376753381 is 183357673836.

It is not a de Polignac number, because 638376753381 - 2¹⁰ = 638376752357 is a prime.

It is a super-2 number, since 2×638376753381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638376753383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154680940 + ... + 154685066.

It is an arithmetic number, because the mean of its divisors is an integer number (26826418944).

Almost surely, 2^638376753381 is an apocalyptic number.

It is an amenable number.

638376753381 is a deficient number, since it is larger than the sum of its proper divisors (220068652827).

638376753381 is a wasteful number, since it uses less digits than its factorization.

638376753381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5281.

The product of its digits is 45722880, while the sum is 60.

The spelling of 638376753381 in words is "six hundred thirty-eight billion, three hundred seventy-six million, seven hundred fifty-three thousand, three hundred eighty-one".