72446452649 has 4 divisors (see below), whose sum is σ = 72460302036. Its totient is φ = 72432603264.

The previous prime is 72446452613. The next prime is 72446452651. The reversal of 72446452649 is 94625464427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62016937024 + 10429515625 = 249032^2 + 102125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72446452649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72446452649.

It is not an unprimeable number, because it can be changed into a prime (72446452849) 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 in 3 ways as a sum of consecutive naturals, for example, 6916844 + ... + 6927309.

It is an arithmetic number, because the mean of its divisors is an integer number (18115075509).

Almost surely, 2^72446452649 is an apocalyptic number.

It is an amenable number.

72446452649 is a deficient number, since it is larger than the sum of its proper divisors (13849387).

72446452649 is a wasteful number, since it uses less digits than its factorization.

72446452649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13849386.

The product of its digits is 11612160, while the sum is 53.

The spelling of 72446452649 in words is "seventy-two billion, four hundred forty-six million, four hundred fifty-two thousand, six hundred forty-nine".