75218813381 has 2 divisors, whose sum is σ = 75218813382. Its totient is φ = 75218813380.

The previous prime is 75218813353. The next prime is 75218813401. The reversal of 75218813381 is 18331881257.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52886200900 + 22332612481 = 229970^2 + 149441^2 .

It is a cyclic number.

It is not a de Polignac number, because 75218813381 - 2⁶ = 75218813317 is a prime.

It is a super-2 number, since 2×75218813381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75218813981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37609406690 + 37609406691.

It is an arithmetic number, because the mean of its divisors is an integer number (37609406691).

Almost surely, 2^75218813381 is an apocalyptic number.

It is an amenable number.

75218813381 is a deficient number, since it is larger than the sum of its proper divisors (1).

75218813381 is an equidigital number, since it uses as much as digits as its factorization.

75218813381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 47.

The spelling of 75218813381 in words is "seventy-five billion, two hundred eighteen million, eight hundred thirteen thousand, three hundred eighty-one".