72715065109 has 2 divisors, whose sum is σ = 72715065110. Its totient is φ = 72715065108.

The previous prime is 72715065061. The next prime is 72715065121. The reversal of 72715065109 is 90156051727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57758508900 + 14956556209 = 240330^2 + 122297^2 .

It is a cyclic number.

It is not a de Polignac number, because 72715065109 - 2¹¹ = 72715063061 is a prime.

It is a super-2 number, since 2×72715065109² (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 (72715065139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36357532554 + 36357532555.

It is an arithmetic number, because the mean of its divisors is an integer number (36357532555).

Almost surely, 2^72715065109 is an apocalyptic number.

It is an amenable number.

72715065109 is a deficient number, since it is larger than the sum of its proper divisors (1).

72715065109 is an equidigital number, since it uses as much as digits as its factorization.

72715065109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300, while the sum is 43.

The spelling of 72715065109 in words is "seventy-two billion, seven hundred fifteen million, sixty-five thousand, one hundred nine".