72752137481 has 2 divisors, whose sum is σ = 72752137482. Its totient is φ = 72752137480.

The previous prime is 72752137459. The next prime is 72752137529. The reversal of 72752137481 is 18473125727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58025101456 + 14727036025 = 240884^2 + 121355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72752137481 is a prime.

It is a super-2 number, since 2×72752137481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72752137421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36376068740 + 36376068741.

It is an arithmetic number, because the mean of its divisors is an integer number (36376068741).

Almost surely, 2^72752137481 is an apocalyptic number.

It is an amenable number.

72752137481 is a deficient number, since it is larger than the sum of its proper divisors (1).

72752137481 is an equidigital number, since it uses as much as digits as its factorization.

72752137481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658560, while the sum is 47.

The spelling of 72752137481 in words is "seventy-two billion, seven hundred fifty-two million, one hundred thirty-seven thousand, four hundred eighty-one".