266625615617 has 2 divisors, whose sum is σ = 266625615618. Its totient is φ = 266625615616.

The previous prime is 266625615611. The next prime is 266625615689. The reversal of 266625615617 is 716516526662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258461408881 + 8164206736 = 508391^2 + 90356^2 .

It is a cyclic number.

It is not a de Polignac number, because 266625615617 - 2¹⁸ = 266625353473 is a prime.

It is not a weakly prime, because it can be changed into another prime (266625615611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133312807808 + 133312807809.

It is an arithmetic number, because the mean of its divisors is an integer number (133312807809).

Almost surely, 2^266625615617 is an apocalyptic number.

It is an amenable number.

266625615617 is a deficient number, since it is larger than the sum of its proper divisors (1).

266625615617 is an equidigital number, since it uses as much as digits as its factorization.

266625615617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 53.

The spelling of 266625615617 in words is "two hundred sixty-six billion, six hundred twenty-five million, six hundred fifteen thousand, six hundred seventeen".