11611127715661 has 2 divisors, whose sum is σ = 11611127715662. Its totient is φ = 11611127715660.

The previous prime is 11611127715659. The next prime is 11611127715673. The reversal of 11611127715661 is 16651772111611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8530523538436 + 3080604177225 = 2920706^2 + 1755165^2 .

It is a cyclic number.

It is not a de Polignac number, because 11611127715661 - 2¹ = 11611127715659 is a prime.

Together with 11611127715659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11611127715961) 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, 5805563857830 + 5805563857831.

It is an arithmetic number, because the mean of its divisors is an integer number (5805563857831).

Almost surely, 2^{11611127715661} is an apocalyptic number.

It is an amenable number.

11611127715661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11611127715661 is an equidigital number, since it uses as much as digits as its factorization.

11611127715661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 46.

The spelling of 11611127715661 in words is "eleven trillion, six hundred eleven billion, one hundred twenty-seven million, seven hundred fifteen thousand, six hundred sixty-one".