26666551531 has 2 divisors, whose sum is σ = 26666551532. Its totient is φ = 26666551530.

The previous prime is 26666551507. The next prime is 26666551537. The reversal of 26666551531 is 13515566662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26666551531 - 2⁷ = 26666551403 is a prime.

It is a super-2 number, since 2×26666551531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26666551537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13333275765 + 13333275766.

It is an arithmetic number, because the mean of its divisors is an integer number (13333275766).

Almost surely, 2^26666551531 is an apocalyptic number.

26666551531 is a deficient number, since it is larger than the sum of its proper divisors (1).

26666551531 is an equidigital number, since it uses as much as digits as its factorization.

26666551531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 46.

The spelling of 26666551531 in words is "twenty-six billion, six hundred sixty-six million, five hundred fifty-one thousand, five hundred thirty-one".