61017668179973 has 2 divisors, whose sum is σ = 61017668179974. Its totient is φ = 61017668179972.

The previous prime is 61017668179961. The next prime is 61017668179997. The reversal of 61017668179973 is 37997186671016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42707767273924 + 18309900906049 = 6535118^2 + 4279007^2 .

It is a cyclic number.

It is not a de Polignac number, because 61017668179973 - 2¹⁰ = 61017668178949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61017668179897 and 61017668179906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61017668179913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30508834089986 + 30508834089987.

It is an arithmetic number, because the mean of its divisors is an integer number (30508834089987).

Almost surely, 2^{61017668179973} is an apocalyptic number.

It is an amenable number.

61017668179973 is a deficient number, since it is larger than the sum of its proper divisors (1).

61017668179973 is an equidigital number, since it uses as much as digits as its factorization.

61017668179973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144027072, while the sum is 71.

The spelling of 61017668179973 in words is "sixty-one trillion, seventeen billion, six hundred sixty-eight million, one hundred seventy-nine thousand, nine hundred seventy-three".