72705957481 has 2 divisors, whose sum is σ = 72705957482. Its totient is φ = 72705957480.

The previous prime is 72705957473. The next prime is 72705957487. The reversal of 72705957481 is 18475950727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63558947881 + 9147009600 = 252109^2 + 95640^2 .

It is a cyclic number.

It is not a de Polignac number, because 72705957481 - 2³ = 72705957473 is a prime.

It is a super-2 number, since 2×72705957481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72705957487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36352978740 + 36352978741.

It is an arithmetic number, because the mean of its divisors is an integer number (36352978741).

Almost surely, 2^72705957481 is an apocalyptic number.

It is an amenable number.

72705957481 is a deficient number, since it is larger than the sum of its proper divisors (1).

72705957481 is an equidigital number, since it uses as much as digits as its factorization.

72705957481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4939200, while the sum is 55.

The spelling of 72705957481 in words is "seventy-two billion, seven hundred five million, nine hundred fifty-seven thousand, four hundred eighty-one".