61281563017 has 2 divisors, whose sum is σ = 61281563018. Its totient is φ = 61281563016.

The previous prime is 61281562987. The next prime is 61281563033. The reversal of 61281563017 is 71036518216.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61251795081 + 29767936 = 247491^2 + 5456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61281563017 is a prime.

It is not a weakly prime, because it can be changed into another prime (61281543017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640781508 + 30640781509.

It is an arithmetic number, because the mean of its divisors is an integer number (30640781509).

Almost surely, 2^61281563017 is an apocalyptic number.

It is an amenable number.

61281563017 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281563017 is an equidigital number, since it uses as much as digits as its factorization.

61281563017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 61281563017 in words is "sixty-one billion, two hundred eighty-one million, five hundred sixty-three thousand, seventeen".