61743340691 has 2 divisors, whose sum is σ = 61743340692. Its totient is φ = 61743340690.

The previous prime is 61743340643. The next prime is 61743340717. The reversal of 61743340691 is 19604334716.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61743340691 is a prime.

It is not a weakly prime, because it can be changed into another prime (61743340601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30871670345 + 30871670346.

It is an arithmetic number, because the mean of its divisors is an integer number (30871670346).

Almost surely, 2^61743340691 is an apocalyptic number.

61743340691 is a deficient number, since it is larger than the sum of its proper divisors (1).

61743340691 is an equidigital number, since it uses as much as digits as its factorization.

61743340691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 61743340691 in words is "sixty-one billion, seven hundred forty-three million, three hundred forty thousand, six hundred ninety-one".