72409086649 has 2 divisors, whose sum is σ = 72409086650. Its totient is φ = 72409086648.

The previous prime is 72409086647. The next prime is 72409086733. The reversal of 72409086649 is 94668090427.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63721914624 + 8687172025 = 252432^2 + 93205^2 .

It is a cyclic number.

It is not a de Polignac number, because 72409086649 - 2¹ = 72409086647 is a prime.

Together with 72409086647, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72409086649.

It is not a weakly prime, because it can be changed into another prime (72409086641) 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, 36204543324 + 36204543325.

It is an arithmetic number, because the mean of its divisors is an integer number (36204543325).

Almost surely, 2^72409086649 is an apocalyptic number.

It is an amenable number.

72409086649 is a deficient number, since it is larger than the sum of its proper divisors (1).

72409086649 is an equidigital number, since it uses as much as digits as its factorization.

72409086649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 72409086649 in words is "seventy-two billion, four hundred nine million, eighty-six thousand, six hundred forty-nine".