61838243861 has 2 divisors, whose sum is σ = 61838243862. Its totient is φ = 61838243860.

The previous prime is 61838243839. The next prime is 61838243933. The reversal of 61838243861 is 16834283816.

61838243861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61786547761 + 51696100 = 248569^2 + 7190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61838243861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61838243161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30919121930 + 30919121931.

It is an arithmetic number, because the mean of its divisors is an integer number (30919121931).

Almost surely, 2^61838243861 is an apocalyptic number.

It is an amenable number.

61838243861 is a deficient number, since it is larger than the sum of its proper divisors (1).

61838243861 is an equidigital number, since it uses as much as digits as its factorization.

61838243861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1327104, while the sum is 50.

The spelling of 61838243861 in words is "sixty-one billion, eight hundred thirty-eight million, two hundred forty-three thousand, eight hundred sixty-one".