72381733261 has 2 divisors, whose sum is σ = 72381733262. Its totient is φ = 72381733260.

The previous prime is 72381733223. The next prime is 72381733321. The reversal of 72381733261 is 16233718327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62282689225 + 10099044036 = 249565^2 + 100494^2 .

It is a cyclic number.

It is not a de Polignac number, because 72381733261 - 2²⁵ = 72348178829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72381733211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36190866630 + 36190866631.

It is an arithmetic number, because the mean of its divisors is an integer number (36190866631).

Almost surely, 2^72381733261 is an apocalyptic number.

It is an amenable number.

72381733261 is a deficient number, since it is larger than the sum of its proper divisors (1).

72381733261 is an equidigital number, since it uses as much as digits as its factorization.

72381733261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 43.

The spelling of 72381733261 in words is "seventy-two billion, three hundred eighty-one million, seven hundred thirty-three thousand, two hundred sixty-one".