26667666617 has 2 divisors, whose sum is σ = 26667666618. Its totient is φ = 26667666616.

The previous prime is 26667666601. The next prime is 26667666631. The reversal of 26667666617 is 71666676662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26483005696 + 184660921 = 162736^2 + 13589^2 .

It is a cyclic number.

It is not a de Polignac number, because 26667666617 - 2⁴ = 26667666601 is a prime.

It is a super-2 number, since 2×26667666617² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26667666217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13333833308 + 13333833309.

It is an arithmetic number, because the mean of its divisors is an integer number (13333833309).

Almost surely, 2^26667666617 is an apocalyptic number.

It is an amenable number.

26667666617 is a deficient number, since it is larger than the sum of its proper divisors (1).

26667666617 is an equidigital number, since it uses as much as digits as its factorization.

26667666617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27433728, while the sum is 59.

The spelling of 26667666617 in words is "twenty-six billion, six hundred sixty-seven million, six hundred sixty-six thousand, six hundred seventeen".