61716605551 has 2 divisors, whose sum is σ = 61716605552. Its totient is φ = 61716605550.

The previous prime is 61716605527. The next prime is 61716605593. The reversal of 61716605551 is 15550661716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61716605551 - 2¹³ = 61716597359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61716605498 and 61716605507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61716605051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30858302775 + 30858302776.

It is an arithmetic number, because the mean of its divisors is an integer number (30858302776).

Almost surely, 2^61716605551 is an apocalyptic number.

61716605551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61716605551 is an equidigital number, since it uses as much as digits as its factorization.

61716605551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 61716605551 in words is "sixty-one billion, seven hundred sixteen million, six hundred five thousand, five hundred fifty-one".