72556864069 has 2 divisors, whose sum is σ = 72556864070. Its totient is φ = 72556864068.

The previous prime is 72556864013. The next prime is 72556864091. The reversal of 72556864069 is 96046865527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41426496225 + 31130367844 = 203535^2 + 176438^2 .

It is a cyclic number.

It is not a de Polignac number, because 72556864069 - 2¹⁹ = 72556339781 is a prime.

It is a super-2 number, since 2×72556864069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72556864169) 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, 36278432034 + 36278432035.

It is an arithmetic number, because the mean of its divisors is an integer number (36278432035).

Almost surely, 2^72556864069 is an apocalyptic number.

It is an amenable number.

72556864069 is a deficient number, since it is larger than the sum of its proper divisors (1).

72556864069 is an equidigital number, since it uses as much as digits as its factorization.

72556864069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 58.

The spelling of 72556864069 in words is "seventy-two billion, five hundred fifty-six million, eight hundred sixty-four thousand, sixty-nine".