61663250897 has 2 divisors, whose sum is σ = 61663250898. Its totient is φ = 61663250896.

The previous prime is 61663250843. The next prime is 61663250899. The reversal of 61663250897 is 79805236616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33263923456 + 28399327441 = 182384^2 + 168521^2 .

It is a cyclic number.

It is not a de Polignac number, because 61663250897 - 2⁸ = 61663250641 is a prime.

It is a super-2 number, since 2×61663250897² (a number of 22 digits) contains 22 as substring.

Together with 61663250899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61663250899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30831625448 + 30831625449.

It is an arithmetic number, because the mean of its divisors is an integer number (30831625449).

Almost surely, 2^61663250897 is an apocalyptic number.

It is an amenable number.

61663250897 is a deficient number, since it is larger than the sum of its proper divisors (1).

61663250897 is an equidigital number, since it uses as much as digits as its factorization.

61663250897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 61663250897 in words is "sixty-one billion, six hundred sixty-three million, two hundred fifty thousand, eight hundred ninety-seven".