61210266617 has 2 divisors, whose sum is σ = 61210266618. Its totient is φ = 61210266616.

The previous prime is 61210266613. The next prime is 61210266629. The reversal of 61210266617 is 71666201216.

61210266617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50024242921 + 11186023696 = 223661^2 + 105764^2 .

It is a cyclic number.

It is not a de Polignac number, because 61210266617 - 2² = 61210266613 is a prime.

It is not a weakly prime, because it can be changed into another prime (61210266613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30605133308 + 30605133309.

It is an arithmetic number, because the mean of its divisors is an integer number (30605133309).

Almost surely, 2^61210266617 is an apocalyptic number.

It is an amenable number.

61210266617 is a deficient number, since it is larger than the sum of its proper divisors (1).

61210266617 is an equidigital number, since it uses as much as digits as its factorization.

61210266617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 61210266617 in words is "sixty-one billion, two hundred ten million, two hundred sixty-six thousand, six hundred seventeen".