75815121113 has 4 divisors (see below), whose sum is σ = 75860548260. Its totient is φ = 75769693968.

The previous prime is 75815121103. The next prime is 75815121121. The reversal of 75815121113 is 31112151857.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31112151857 = 134471 ⋅231367.

It can be written as a sum of positive squares in 2 ways, for example, as 35489661769 + 40325459344 = 188387^2 + 200812^2 .

It is a cyclic number.

It is not a de Polignac number, because 75815121113 - 2¹⁸ = 75814858969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75815121103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22711070 + ... + 22714407.

It is an arithmetic number, because the mean of its divisors is an integer number (18965137065).

Almost surely, 2^75815121113 is an apocalyptic number.

It is an amenable number.

75815121113 is a deficient number, since it is larger than the sum of its proper divisors (45427147).

75815121113 is a wasteful number, since it uses less digits than its factorization.

75815121113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45427146.

The product of its digits is 8400, while the sum is 35.

The spelling of 75815121113 in words is "seventy-five billion, eight hundred fifteen million, one hundred twenty-one thousand, one hundred thirteen".