61105999957 has 2 divisors, whose sum is σ = 61105999958. Its totient is φ = 61105999956.

The previous prime is 61105999943. The next prime is 61106000003. The reversal of 61105999957 is 75999950116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54668986596 + 6437013361 = 233814^2 + 80231^2 .

It is a cyclic number.

It is not a de Polignac number, because 61105999957 - 2²⁷ = 60971782229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61105999895 and 61105999904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61105999457) 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, 30552999978 + 30552999979.

It is an arithmetic number, because the mean of its divisors is an integer number (30552999979).

Almost surely, 2^61105999957 is an apocalyptic number.

It is an amenable number.

61105999957 is a deficient number, since it is larger than the sum of its proper divisors (1).

61105999957 is an equidigital number, since it uses as much as digits as its factorization.

61105999957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6889050, while the sum is 61.

The spelling of 61105999957 in words is "sixty-one billion, one hundred five million, nine hundred ninety-nine thousand, nine hundred fifty-seven".