61010605561 has 2 divisors, whose sum is σ = 61010605562. Its totient is φ = 61010605560.

The previous prime is 61010605493. The next prime is 61010605573. The reversal of 61010605561 is 16550601016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35591086336 + 25419519225 = 188656^2 + 159435^2 .

It is a cyclic number.

It is not a de Polignac number, because 61010605561 - 2²⁹ = 60473734649 is a prime.

It is not a weakly prime, because it can be changed into another prime (61010665561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30505302780 + 30505302781.

It is an arithmetic number, because the mean of its divisors is an integer number (30505302781).

Almost surely, 2^61010605561 is an apocalyptic number.

It is an amenable number.

61010605561 is a deficient number, since it is larger than the sum of its proper divisors (1).

61010605561 is an equidigital number, since it uses as much as digits as its factorization.

61010605561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 61010605561 in words is "sixty-one billion, ten million, six hundred five thousand, five hundred sixty-one".