61685759 has 2 divisors, whose sum is σ = 61685760. Its totient is φ = 61685758.

The previous prime is 61685749. The next prime is 61685777. The reversal of 61685759 is 95758616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61685759 - 2²⁰ = 60637183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61685719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30842879 + 30842880.

It is an arithmetic number, because the mean of its divisors is an integer number (30842880).

Almost surely, 2^61685759 is an apocalyptic number.

61685759 is a deficient number, since it is larger than the sum of its proper divisors (1).

61685759 is an equidigital number, since it uses as much as digits as its factorization.

61685759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 47.

The square root of 61685759 is about 7854.0282021393. The cubic root of 61685759 is about 395.1193550547.

The spelling of 61685759 in words is "sixty-one million, six hundred eighty-five thousand, seven hundred fifty-nine".