61885194432857 has 2 divisors, whose sum is σ = 61885194432858. Its totient is φ = 61885194432856.

The previous prime is 61885194432839. The next prime is 61885194432953. The reversal of 61885194432857 is 75823449158816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60214433961616 + 1670760471241 = 7759796^2 + 1292579^2 .

It is a cyclic number.

It is not a de Polignac number, because 61885194432857 - 2⁶ = 61885194432793 is a prime.

It is not a weakly prime, because it can be changed into another prime (61885194432827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30942597216428 + 30942597216429.

It is an arithmetic number, because the mean of its divisors is an integer number (30942597216429).

Almost surely, 2^{61885194432857} is an apocalyptic number.

It is an amenable number.

61885194432857 is a deficient number, since it is larger than the sum of its proper divisors (1).

61885194432857 is an equidigital number, since it uses as much as digits as its factorization.

61885194432857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 464486400, while the sum is 71.

The spelling of 61885194432857 in words is "sixty-one trillion, eight hundred eighty-five billion, one hundred ninety-four million, four hundred thirty-two thousand, eight hundred fifty-seven".