61684260727 has 2 divisors, whose sum is σ = 61684260728. Its totient is φ = 61684260726.

The previous prime is 61684260721. The next prime is 61684260749. The reversal of 61684260727 is 72706248616.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61684260727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61684260721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30842130363 + 30842130364.

It is an arithmetic number, because the mean of its divisors is an integer number (30842130364).

Almost surely, 2^61684260727 is an apocalyptic number.

61684260727 is a deficient number, since it is larger than the sum of its proper divisors (1).

61684260727 is an equidigital number, since it uses as much as digits as its factorization.

61684260727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 61684260727 in words is "sixty-one billion, six hundred eighty-four million, two hundred sixty thousand, seven hundred twenty-seven".