11610511600661 has 2 divisors, whose sum is σ = 11610511600662. Its totient is φ = 11610511600660.

The previous prime is 11610511600643. The next prime is 11610511600729. The reversal of 11610511600661 is 16600611501611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9643701695761 + 1966809904900 = 3105431^2 + 1402430^2 .

It is a cyclic number.

It is not a de Polignac number, because 11610511600661 - 2²² = 11610507406357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11610511600621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5805255800330 + 5805255800331.

It is an arithmetic number, because the mean of its divisors is an integer number (5805255800331).

Almost surely, 2^{11610511600661} is an apocalyptic number.

It is an amenable number.

11610511600661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11610511600661 is an equidigital number, since it uses as much as digits as its factorization.

11610511600661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 11610511600661 in words is "eleven trillion, six hundred ten billion, five hundred eleven million, six hundred thousand, six hundred sixty-one".