11658788378561 has 2 divisors, whose sum is σ = 11658788378562. Its totient is φ = 11658788378560.

The previous prime is 11658788378551. The next prime is 11658788378597. The reversal of 11658788378561 is 16587388785611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11070892017025 + 587896361536 = 3327295^2 + 766744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11658788378561 is a prime.

It is not a weakly prime, because it can be changed into another prime (11658788378551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5829394189280 + 5829394189281.

It is an arithmetic number, because the mean of its divisors is an integer number (5829394189281).

Almost surely, 2^{11658788378561} is an apocalyptic number.

It is an amenable number.

11658788378561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11658788378561 is an equidigital number, since it uses as much as digits as its factorization.

11658788378561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 541900800, while the sum is 74.

The spelling of 11658788378561 in words is "eleven trillion, six hundred fifty-eight billion, seven hundred eighty-eight million, three hundred seventy-eight thousand, five hundred sixty-one".