75521281868 has 12 divisors (see below), whose sum is σ = 132166529880. Its totient is φ = 37759416192.

The previous prime is 75521281867. The next prime is 75521281897. The reversal of 75521281868 is 86818212557.

It is not an unprimeable number, because it can be changed into a prime (75521281867) 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, 159653 + ... + 420156.

It is an arithmetic number, because the mean of its divisors is an integer number (11013877490).

Almost surely, 2^75521281868 is an apocalyptic number.

It is an amenable number.

75521281868 is a deficient number, since it is larger than the sum of its proper divisors (56645248012).

75521281868 is a wasteful number, since it uses less digits than its factorization.

75521281868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612376 (or 612374 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 53.

The spelling of 75521281868 in words is "seventy-five billion, five hundred twenty-one million, two hundred eighty-one thousand, eight hundred sixty-eight".