61716871751 has 2 divisors, whose sum is σ = 61716871752. Its totient is φ = 61716871750.

The previous prime is 61716871709. The next prime is 61716871781. The reversal of 61716871751 is 15717861716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61716871751 - 2³⁰ = 60643129927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61716871751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61716871781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30858435875 + 30858435876.

It is an arithmetic number, because the mean of its divisors is an integer number (30858435876).

Almost surely, 2^61716871751 is an apocalyptic number.

61716871751 is a deficient number, since it is larger than the sum of its proper divisors (1).

61716871751 is an equidigital number, since it uses as much as digits as its factorization.

61716871751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 50.

The spelling of 61716871751 in words is "sixty-one billion, seven hundred sixteen million, eight hundred seventy-one thousand, seven hundred fifty-one".