61512651217 has 2 divisors, whose sum is σ = 61512651218. Its totient is φ = 61512651216.

The previous prime is 61512651203. The next prime is 61512651223. The reversal of 61512651217 is 71215621516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59223602881 + 2289048336 = 243359^2 + 47844^2 .

It is a cyclic number.

It is not a de Polignac number, because 61512651217 - 2¹⁵ = 61512618449 is a prime.

It is not a weakly prime, because it can be changed into another prime (61512651227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30756325608 + 30756325609.

It is an arithmetic number, because the mean of its divisors is an integer number (30756325609).

Almost surely, 2^61512651217 is an apocalyptic number.

It is an amenable number.

61512651217 is a deficient number, since it is larger than the sum of its proper divisors (1).

61512651217 is an equidigital number, since it uses as much as digits as its factorization.

61512651217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 37.

The spelling of 61512651217 in words is "sixty-one billion, five hundred twelve million, six hundred fifty-one thousand, two hundred seventeen".