61983087217 has 2 divisors, whose sum is σ = 61983087218. Its totient is φ = 61983087216.

The previous prime is 61983087211. The next prime is 61983087227. The reversal of 61983087217 is 71278038916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60121078416 + 1862008801 = 245196^2 + 43151^2 .

It is a cyclic number.

It is not a de Polignac number, because 61983087217 - 2³⁵ = 27623348849 is a prime.

It is not a weakly prime, because it can be changed into another prime (61983087211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30991543608 + 30991543609.

It is an arithmetic number, because the mean of its divisors is an integer number (30991543609).

Almost surely, 2^61983087217 is an apocalyptic number.

It is an amenable number.

61983087217 is a deficient number, since it is larger than the sum of its proper divisors (1).

61983087217 is an equidigital number, since it uses as much as digits as its factorization.

61983087217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 61983087217 in words is "sixty-one billion, nine hundred eighty-three million, eighty-seven thousand, two hundred seventeen".