72324756056621 has 4 divisors (see below), whose sum is σ = 72325180277532. Its totient is φ = 72324331835712.

The previous prime is 72324756056593. The next prime is 72324756056669. The reversal of 72324756056621 is 12665065742327.

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 18593085280900 + 53731670775721 = 4311970^2 + 7330189^2 .

It is a cyclic number.

It is not a de Polignac number, because 72324756056621 - 2¹⁸ = 72324755794477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72324756056521) 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 in 3 ways as a sum of consecutive naturals, for example, 211854620 + ... + 212195733.

It is an arithmetic number, because the mean of its divisors is an integer number (18081295069383).

Almost surely, 2^{72324756056621} is an apocalyptic number.

It is an amenable number.

72324756056621 is a deficient number, since it is larger than the sum of its proper divisors (424220911).

72324756056621 is a wasteful number, since it uses less digits than its factorization.

72324756056621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424220910.

The product of its (nonzero) digits is 25401600, while the sum is 56.

The spelling of 72324756056621 in words is "seventy-two trillion, three hundred twenty-four billion, seven hundred fifty-six million, fifty-six thousand, six hundred twenty-one".