61020081077 has 2 divisors, whose sum is σ = 61020081078. Its totient is φ = 61020081076.

The previous prime is 61020081049. The next prime is 61020081091. The reversal of 61020081077 is 77018002016.

61020081077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55248032401 + 5772048676 = 235049^2 + 75974^2 .

It is a cyclic number.

It is not a de Polignac number, because 61020081077 - 2¹⁸ = 61019818933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61020081007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30510040538 + 30510040539.

It is an arithmetic number, because the mean of its divisors is an integer number (30510040539).

Almost surely, 2^61020081077 is an apocalyptic number.

It is an amenable number.

61020081077 is a deficient number, since it is larger than the sum of its proper divisors (1).

61020081077 is an equidigital number, since it uses as much as digits as its factorization.

61020081077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The spelling of 61020081077 in words is "sixty-one billion, twenty million, eighty-one thousand, seventy-seven".