72281765556037 has 2 divisors, whose sum is σ = 72281765556038. Its totient is φ = 72281765556036.

The previous prime is 72281765555971. The next prime is 72281765556047. The reversal of 72281765556037 is 73065556718227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68044532685921 + 4237232870116 = 8248911^2 + 2058454^2 .

It is an emirp because it is prime and its reverse (73065556718227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72281765556037 - 2²³ = 72281757167429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72281765556037.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72281765556047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140882778018 + 36140882778019.

It is an arithmetic number, because the mean of its divisors is an integer number (36140882778019).

Almost surely, 2^{72281765556037} is an apocalyptic number.

It is an amenable number.

72281765556037 is a deficient number, since it is larger than the sum of its proper divisors (1).

72281765556037 is an equidigital number, since it uses as much as digits as its factorization.

72281765556037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176000, while the sum is 64.

The spelling of 72281765556037 in words is "seventy-two trillion, two hundred eighty-one billion, seven hundred sixty-five million, five hundred fifty-six thousand, thirty-seven".