61017668704261 has 2 divisors, whose sum is σ = 61017668704262. Its totient is φ = 61017668704260.

The previous prime is 61017668704249. The next prime is 61017668704313. The reversal of 61017668704261 is 16240786671016.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52969065660225 + 8048603044036 = 7277985^2 + 2837006^2 .

It is a cyclic number.

It is not a de Polignac number, because 61017668704261 - 2¹⁹ = 61017668179973 is a prime.

It is a super-2 number, since 2×61017668704261² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61017668704231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30508834352130 + 30508834352131.

It is an arithmetic number, because the mean of its divisors is an integer number (30508834352131).

Almost surely, 2^{61017668704261} is an apocalyptic number.

It is an amenable number.

61017668704261 is a deficient number, since it is larger than the sum of its proper divisors (1).

61017668704261 is an equidigital number, since it uses as much as digits as its factorization.

61017668704261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 61017668704261 in words is "sixty-one trillion, seventeen billion, six hundred sixty-eight million, seven hundred four thousand, two hundred sixty-one".