61716871709 has 2 divisors, whose sum is σ = 61716871710. Its totient is φ = 61716871708.

The previous prime is 61716871691. The next prime is 61716871751. The reversal of 61716871709 is 90717861716.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54424224100 + 7292647609 = 233290^2 + 85397^2 .

It is a cyclic number.

It is not a de Polignac number, because 61716871709 - 2²⁰ = 61715823133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61716871109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30858435854 + 30858435855.

It is an arithmetic number, because the mean of its divisors is an integer number (30858435855).

Almost surely, 2^61716871709 is an apocalyptic number.

It is an amenable number.

61716871709 is a deficient number, since it is larger than the sum of its proper divisors (1).

61716871709 is an equidigital number, since it uses as much as digits as its factorization.

61716871709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 889056, while the sum is 53.

The spelling of 61716871709 in words is "sixty-one billion, seven hundred sixteen million, eight hundred seventy-one thousand, seven hundred nine".