73243975681 has 2 divisors, whose sum is σ = 73243975682. Its totient is φ = 73243975680.

The previous prime is 73243975643. The next prime is 73243975699. The reversal of 73243975681 is 18657934237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52536765681 + 20707210000 = 229209^2 + 143900^2 .

It is a cyclic number.

It is not a de Polignac number, because 73243975681 - 2¹¹ = 73243973633 is a prime.

It is a super-2 number, since 2×73243975681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73243975631) 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, 36621987840 + 36621987841.

It is an arithmetic number, because the mean of its divisors is an integer number (36621987841).

Almost surely, 2^73243975681 is an apocalyptic number.

It is an amenable number.

73243975681 is a deficient number, since it is larger than the sum of its proper divisors (1).

73243975681 is an equidigital number, since it uses as much as digits as its factorization.

73243975681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 55.

The spelling of 73243975681 in words is "seventy-three billion, two hundred forty-three million, nine hundred seventy-five thousand, six hundred eighty-one".