75288992981 has 4 divisors (see below), whose sum is σ = 79717757292. Its totient is φ = 70860228672.

The previous prime is 75288992969. The next prime is 75288993011. The reversal of 75288992981 is 18929988257.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45751071025 + 29537921956 = 213895^2 + 171866^2 .

It is a cyclic number.

It is not a de Polignac number, because 75288992981 - 2⁶ = 75288992917 is a prime.

It is a super-2 number, since 2×75288992981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75288995981) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2214382130 + ... + 2214382163.

It is an arithmetic number, because the mean of its divisors is an integer number (19929439323).

Almost surely, 2^75288992981 is an apocalyptic number.

It is an amenable number.

75288992981 is a deficient number, since it is larger than the sum of its proper divisors (4428764311).

75288992981 is a wasteful number, since it uses less digits than its factorization.

75288992981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428764310.

The product of its digits is 52254720, while the sum is 68.

The spelling of 75288992981 in words is "seventy-five billion, two hundred eighty-eight million, nine hundred ninety-two thousand, nine hundred eighty-one".