61666697 has 2 divisors, whose sum is σ = 61666698. Its totient is φ = 61666696.

The previous prime is 61666691. The next prime is 61666721. The reversal of 61666697 is 79666616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59428681 + 2238016 = 7709^2 + 1496^2 .

It is a cyclic number.

It is not a de Polignac number, because 61666697 - 2⁴ = 61666681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61666691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30833348 + 30833349.

It is an arithmetic number, because the mean of its divisors is an integer number (30833349).

Almost surely, 2^61666697 is an apocalyptic number.

It is an amenable number.

61666697 is a deficient number, since it is larger than the sum of its proper divisors (1).

61666697 is an equidigital number, since it uses as much as digits as its factorization.

61666697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 61666697 is about 7852.8145909604. The cubic root of 61666697 is about 395.0786512185.

The spelling of 61666697 in words is "sixty-one million, six hundred sixty-six thousand, six hundred ninety-seven".