61116555077 has 2 divisors, whose sum is σ = 61116555078. Its totient is φ = 61116555076.

The previous prime is 61116555061. The next prime is 61116555127. The reversal of 61116555077 is 77055561116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41245141921 + 19871413156 = 203089^2 + 140966^2 .

It is a cyclic number.

It is not a de Polignac number, because 61116555077 - 2⁴ = 61116555061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61116555047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30558277538 + 30558277539.

It is an arithmetic number, because the mean of its divisors is an integer number (30558277539).

Almost surely, 2^61116555077 is an apocalyptic number.

It is an amenable number.

61116555077 is a deficient number, since it is larger than the sum of its proper divisors (1).

61116555077 is an equidigital number, since it uses as much as digits as its factorization.

61116555077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 220500, while the sum is 44.

The spelling of 61116555077 in words is "sixty-one billion, one hundred sixteen million, five hundred fifty-five thousand, seventy-seven".