61663776497 has 2 divisors, whose sum is σ = 61663776498. Its totient is φ = 61663776496.

The previous prime is 61663776479. The next prime is 61663776521. The reversal of 61663776497 is 79467736616.

Together with previous prime (61663776479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53368392256 + 8295384241 = 231016^2 + 91079^2 .

It is a cyclic number.

It is not a de Polignac number, because 61663776497 - 2¹⁴ = 61663760113 is a prime.

It is not a weakly prime, because it can be changed into another prime (61663776467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30831888248 + 30831888249.

It is an arithmetic number, because the mean of its divisors is an integer number (30831888249).

Almost surely, 2^61663776497 is an apocalyptic number.

It is an amenable number.

61663776497 is a deficient number, since it is larger than the sum of its proper divisors (1).

61663776497 is an equidigital number, since it uses as much as digits as its factorization.

61663776497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48009024, while the sum is 62.

The spelling of 61663776497 in words is "sixty-one billion, six hundred sixty-three million, seven hundred seventy-six thousand, four hundred ninety-seven".