61638163177 has 2 divisors, whose sum is σ = 61638163178. Its totient is φ = 61638163176.

The previous prime is 61638163141. The next prime is 61638163189. The reversal of 61638163177 is 77136183616.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39511898176 + 22126265001 = 198776^2 + 148749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61638163177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61638163177.

It is not a weakly prime, because it can be changed into another prime (61638113177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30819081588 + 30819081589.

It is an arithmetic number, because the mean of its divisors is an integer number (30819081589).

Almost surely, 2^61638163177 is an apocalyptic number.

It is an amenable number.

61638163177 is a deficient number, since it is larger than the sum of its proper divisors (1).

61638163177 is an equidigital number, since it uses as much as digits as its factorization.

61638163177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The spelling of 61638163177 in words is "sixty-one billion, six hundred thirty-eight million, one hundred sixty-three thousand, one hundred seventy-seven".