61886662177 has 2 divisors, whose sum is σ = 61886662178. Its totient is φ = 61886662176.

The previous prime is 61886662169. The next prime is 61886662199. The reversal of 61886662177 is 77126668816.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51510387681 + 10376274496 = 226959^2 + 101864^2 .

It is a cyclic number.

It is not a de Polignac number, because 61886662177 - 2³ = 61886662169 is a prime.

It is not a weakly prime, because it can be changed into another prime (61886663177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30943331088 + 30943331089.

It is an arithmetic number, because the mean of its divisors is an integer number (30943331089).

Almost surely, 2^61886662177 is an apocalyptic number.

It is an amenable number.

61886662177 is a deficient number, since it is larger than the sum of its proper divisors (1).

61886662177 is an equidigital number, since it uses as much as digits as its factorization.

61886662177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 58.

The spelling of 61886662177 in words is "sixty-one billion, eight hundred eighty-six million, six hundred sixty-two thousand, one hundred seventy-seven".