75918121638 has 8 divisors (see below), whose sum is σ = 151836243288. Its totient is φ = 25306040544.

The previous prime is 75918121633. The next prime is 75918121679. The reversal of 75918121638 is 83612181957.

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

75918121638 is an admirable number.

It is a super-2 number, since 2×75918121638² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75918121633) 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 3 ways as a sum of consecutive naturals, for example, 6326510131 + ... + 6326510142.

It is an arithmetic number, because the mean of its divisors is an integer number (18979530411).

Almost surely, 2^75918121638 is an apocalyptic number.

75918121638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

75918121638 is a wasteful number, since it uses less digits than its factorization.

75918121638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12653020278.

The product of its digits is 725760, while the sum is 51.

The spelling of 75918121638 in words is "seventy-five billion, nine hundred eighteen million, one hundred twenty-one thousand, six hundred thirty-eight".