63138881375 has 16 divisors (see below), whose sum is σ = 78928528224. Its totient is φ = 50427000000.

The previous prime is 63138881371. The next prime is 63138881381. The reversal of 63138881375 is 57318883136.

It is a happy number.

It is not a de Polignac number, because 63138881375 - 2² = 63138881371 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63138881371) 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, 345101 + ... + 495350.

It is an arithmetic number, because the mean of its divisors is an integer number (4933033014).

Almost surely, 2^63138881375 is an apocalyptic number.

63138881375 is a deficient number, since it is larger than the sum of its proper divisors (15789646849).

63138881375 is an equidigital number, since it uses as much as digits as its factorization.

63138881375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841067 (or 841057 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The spelling of 63138881375 in words is "sixty-three billion, one hundred thirty-eight million, eight hundred eighty-one thousand, three hundred seventy-five".