55661810969461 has 2 divisors, whose sum is σ = 55661810969462. Its totient is φ = 55661810969460.

The previous prime is 55661810969419. The next prime is 55661810969473. The reversal of 55661810969461 is 16496901816655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34878296466225 + 20783514503236 = 5905785^2 + 4558894^2 .

It is a cyclic number.

It is not a de Polignac number, because 55661810969461 - 2¹³ = 55661810961269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55661810969161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27830905484730 + 27830905484731.

It is an arithmetic number, because the mean of its divisors is an integer number (27830905484731).

Almost surely, 2^{55661810969461} is an apocalyptic number.

It is an amenable number.

55661810969461 is a deficient number, since it is larger than the sum of its proper divisors (1).

55661810969461 is an equidigital number, since it uses as much as digits as its factorization.

55661810969461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83980800, while the sum is 67.

The spelling of 55661810969461 in words is "fifty-five trillion, six hundred sixty-one billion, eight hundred ten million, nine hundred sixty-nine thousand, four hundred sixty-one".