266451231155861 has 2 divisors, whose sum is σ = 266451231155862. Its totient is φ = 266451231155860.

The previous prime is 266451231155833. The next prime is 266451231155873. The reversal of 266451231155861 is 168551132154662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242476439439025 + 23974791716836 = 15571655^2 + 4896406^2 .

It is a cyclic number.

It is not a de Polignac number, because 266451231155861 - 2¹⁰ = 266451231154837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 266451231155797 and 266451231155806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266451231155891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133225615577930 + 133225615577931.

It is an arithmetic number, because the mean of its divisors is an integer number (133225615577931).

Almost surely, 2^{266451231155861} is an apocalyptic number.

It is an amenable number.

266451231155861 is a deficient number, since it is larger than the sum of its proper divisors (1).

266451231155861 is an equidigital number, since it uses as much as digits as its factorization.

266451231155861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368000, while the sum is 56.

The spelling of 266451231155861 in words is "two hundred sixty-six trillion, four hundred fifty-one billion, two hundred thirty-one million, one hundred fifty-five thousand, eight hundred sixty-one".