11761225420661 has 2 divisors, whose sum is σ = 11761225420662. Its totient is φ = 11761225420660.

The previous prime is 11761225420657. The next prime is 11761225420663. The reversal of 11761225420661 is 16602452216711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7372175280625 + 4389050140036 = 2715175^2 + 2095006^2 .

It is a cyclic number.

It is not a de Polignac number, because 11761225420661 - 2² = 11761225420657 is a prime.

Together with 11761225420663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11761225420663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5880612710330 + 5880612710331.

It is an arithmetic number, because the mean of its divisors is an integer number (5880612710331).

Almost surely, 2^{11761225420661} is an apocalyptic number.

It is an amenable number.

11761225420661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11761225420661 is an equidigital number, since it uses as much as digits as its factorization.

11761225420661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 11761225420661 in words is "eleven trillion, seven hundred sixty-one billion, two hundred twenty-five million, four hundred twenty thousand, six hundred sixty-one".