61368661 has 2 divisors, whose sum is σ = 61368662. Its totient is φ = 61368660.

The previous prime is 61368569. The next prime is 61368679. The reversal of 61368661 is 16686316.

It is a happy number.

61368661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61324561 + 44100 = 7831^2 + 210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61368661 is a prime.

It is a super-2 number, since 2×61368661² = 7532225105865842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61368661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61366661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30684330 + 30684331.

It is an arithmetic number, because the mean of its divisors is an integer number (30684331).

Almost surely, 2^61368661 is an apocalyptic number.

It is an amenable number.

61368661 is a deficient number, since it is larger than the sum of its proper divisors (1).

61368661 is an equidigital number, since it uses as much as digits as its factorization.

61368661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 61368661 is about 7833.8152263121. The cubic root of 61368661 is about 394.4411495651.

The spelling of 61368661 in words is "sixty-one million, three hundred sixty-eight thousand, six hundred sixty-one".