72366509330821 has 2 divisors, whose sum is σ = 72366509330822. Its totient is φ = 72366509330820.

The previous prime is 72366509330789. The next prime is 72366509330851. The reversal of 72366509330821 is 12803390566327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72285534368100 + 80974962721 = 8502090^2 + 284561^2 .

It is a cyclic number.

It is not a de Polignac number, because 72366509330821 - 2⁵ = 72366509330789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72366509330851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36183254665410 + 36183254665411.

It is an arithmetic number, because the mean of its divisors is an integer number (36183254665411).

Almost surely, 2^{72366509330821} is an apocalyptic number.

It is an amenable number.

72366509330821 is a deficient number, since it is larger than the sum of its proper divisors (1).

72366509330821 is an equidigital number, since it uses as much as digits as its factorization.

72366509330821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 55.

The spelling of 72366509330821 in words is "seventy-two trillion, three hundred sixty-six billion, five hundred nine million, three hundred thirty thousand, eight hundred twenty-one".