61638163141 has 2 divisors, whose sum is σ = 61638163142. Its totient is φ = 61638163140.

The previous prime is 61638163073. The next prime is 61638163177. The reversal of 61638163141 is 14136183616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60757320100 + 880843041 = 246490^2 + 29679^2 .

It is a cyclic number.

It is not a de Polignac number, because 61638163141 - 2⁹ = 61638162629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61638163094 and 61638163103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61638163241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30819081570 + 30819081571.

It is an arithmetic number, because the mean of its divisors is an integer number (30819081571).

Almost surely, 2^61638163141 is an apocalyptic number.

It is an amenable number.

61638163141 is a deficient number, since it is larger than the sum of its proper divisors (1).

61638163141 is an equidigital number, since it uses as much as digits as its factorization.

61638163141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The spelling of 61638163141 in words is "sixty-one billion, six hundred thirty-eight million, one hundred sixty-three thousand, one hundred forty-one".