61091486098777 has 2 divisors, whose sum is σ = 61091486098778. Its totient is φ = 61091486098776.

The previous prime is 61091486098739. The next prime is 61091486098807. The reversal of 61091486098777 is 77789068419016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57740788797696 + 3350697301081 = 7598736^2 + 1830491^2 .

It is a cyclic number.

It is not a de Polignac number, because 61091486098777 - 2¹⁹ = 61091485574489 is a prime.

It is not a weakly prime, because it can be changed into another prime (61091483098777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30545743049388 + 30545743049389.

It is an arithmetic number, because the mean of its divisors is an integer number (30545743049389).

Almost surely, 2^{61091486098777} is an apocalyptic number.

It is an amenable number.

61091486098777 is a deficient number, since it is larger than the sum of its proper divisors (1).

61091486098777 is an equidigital number, since it uses as much as digits as its factorization.

61091486098777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256048128, while the sum is 73.

The spelling of 61091486098777 in words is "sixty-one trillion, ninety-one billion, four hundred eighty-six million, ninety-eight thousand, seven hundred seventy-seven".