61660243 has 2 divisors, whose sum is σ = 61660244. Its totient is φ = 61660242.

The previous prime is 61660231. The next prime is 61660279. The reversal of 61660243 is 34206616.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61660243 is a prime.

It is not a weakly prime, because it can be changed into another prime (61660213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30830121 + 30830122.

It is an arithmetic number, because the mean of its divisors is an integer number (30830122).

Almost surely, 2^61660243 is an apocalyptic number.

61660243 is a deficient number, since it is larger than the sum of its proper divisors (1).

61660243 is an equidigital number, since it uses as much as digits as its factorization.

61660243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 61660243 is about 7852.4036447447. The cubic root of 61660243 is about 395.0648678384.

Adding to 61660243 its reverse (34206616), we get a palindrome (95866859).

The spelling of 61660243 in words is "sixty-one million, six hundred sixty thousand, two hundred forty-three".