75815506538 has 4 divisors (see below), whose sum is σ = 113723259810. Its totient is φ = 37907753268.

The previous prime is 75815506517. The next prime is 75815506553. The reversal of 75815506538 is 83560551857.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75799450489 + 16056049 = 275317^2 + 4007^2 .

It is a super-2 number, since 2×75815506538² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 75815506538.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18953876633 + ... + 18953876636.

Almost surely, 2^75815506538 is an apocalyptic number.

75815506538 is a deficient number, since it is larger than the sum of its proper divisors (37907753272).

75815506538 is a wasteful number, since it uses less digits than its factorization.

75815506538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37907753271.

The product of its (nonzero) digits is 5040000, while the sum is 53.

The spelling of 75815506538 in words is "seventy-five billion, eight hundred fifteen million, five hundred six thousand, five hundred thirty-eight".