12072757561 has 2 divisors, whose sum is σ = 12072757562. Its totient is φ = 12072757560.

The previous prime is 12072757549. The next prime is 12072757577. The reversal of 12072757561 is 16575727021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11778977961 + 293779600 = 108531^2 + 17140^2 .

It is a cyclic number.

It is not a de Polignac number, because 12072757561 - 2¹³ = 12072749369 is a prime.

It is not a weakly prime, because it can be changed into another prime (12072757261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6036378780 + 6036378781.

It is an arithmetic number, because the mean of its divisors is an integer number (6036378781).

Almost surely, 2^12072757561 is an apocalyptic number.

It is an amenable number.

12072757561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12072757561 is an equidigital number, since it uses as much as digits as its factorization.

12072757561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 205800, while the sum is 43.

The spelling of 12072757561 in words is "twelve billion, seventy-two million, seven hundred fifty-seven thousand, five hundred sixty-one".