72281691474389 has 2 divisors, whose sum is σ = 72281691474390. Its totient is φ = 72281691474388.

The previous prime is 72281691474371. The next prime is 72281691474521. The reversal of 72281691474389 is 98347419618227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71135442877489 + 1146248596900 = 8434183^2 + 1070630^2 .

It is a cyclic number.

It is not a de Polignac number, because 72281691474389 - 2¹² = 72281691470293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72281691474589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140845737194 + 36140845737195.

It is an arithmetic number, because the mean of its divisors is an integer number (36140845737195).

Almost surely, 2^{72281691474389} is an apocalyptic number.

It is an amenable number.

72281691474389 is a deficient number, since it is larger than the sum of its proper divisors (1).

72281691474389 is an equidigital number, since it uses as much as digits as its factorization.

72281691474389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 292626432, while the sum is 71.

The spelling of 72281691474389 in words is "seventy-two trillion, two hundred eighty-one billion, six hundred ninety-one million, four hundred seventy-four thousand, three hundred eighty-nine".