72120565241551 has 2 divisors, whose sum is σ = 72120565241552. Its totient is φ = 72120565241550.

The previous prime is 72120565241521. The next prime is 72120565241561. The reversal of 72120565241551 is 15514256502127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72120565241551 - 2¹³ = 72120565233359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72120565241521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36060282620775 + 36060282620776.

It is an arithmetic number, because the mean of its divisors is an integer number (36060282620776).

Almost surely, 2^{72120565241551} is an apocalyptic number.

72120565241551 is a deficient number, since it is larger than the sum of its proper divisors (1).

72120565241551 is an equidigital number, since it uses as much as digits as its factorization.

72120565241551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840000, while the sum is 46.

The spelling of 72120565241551 in words is "seventy-two trillion, one hundred twenty billion, five hundred sixty-five million, two hundred forty-one thousand, five hundred fifty-one".