72612565481 has 2 divisors, whose sum is σ = 72612565482. Its totient is φ = 72612565480.

The previous prime is 72612565463. The next prime is 72612565489. The reversal of 72612565481 is 18456521627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70551859456 + 2060706025 = 265616^2 + 45395^2 .

It is a cyclic number.

It is not a de Polignac number, because 72612565481 - 2²² = 72608371177 is a prime.

It is a super-2 number, since 2×72612565481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72612565489) 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, 36306282740 + 36306282741.

It is an arithmetic number, because the mean of its divisors is an integer number (36306282741).

Almost surely, 2^72612565481 is an apocalyptic number.

It is an amenable number.

72612565481 is a deficient number, since it is larger than the sum of its proper divisors (1).

72612565481 is an equidigital number, since it uses as much as digits as its factorization.

72612565481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 47.

The spelling of 72612565481 in words is "seventy-two billion, six hundred twelve million, five hundred sixty-five thousand, four hundred eighty-one".