75867168721 has 4 divisors (see below), whose sum is σ = 76376344500. Its totient is φ = 75357992944.

The previous prime is 75867168683. The next prime is 75867168779. The reversal of 75867168721 is 12786176857.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12786176857 = 653 ⋅19580669.

It can be written as a sum of positive squares in 2 ways, for example, as 44453505600 + 31413663121 = 210840^2 + 177239^2 .

It is a cyclic number.

It is not a de Polignac number, because 75867168721 - 2¹¹ = 75867166673 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75867168781) 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, 254587666 + ... + 254587963.

It is an arithmetic number, because the mean of its divisors is an integer number (19094086125).

Almost surely, 2^75867168721 is an apocalyptic number.

It is an amenable number.

75867168721 is a deficient number, since it is larger than the sum of its proper divisors (509175779).

75867168721 is a wasteful number, since it uses less digits than its factorization.

75867168721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509175778.

The product of its digits is 7902720, while the sum is 58.

The spelling of 75867168721 in words is "seventy-five billion, eight hundred sixty-seven million, one hundred sixty-eight thousand, seven hundred twenty-one".