266949457123969 has 4 divisors (see below), whose sum is σ = 266953857861460. Its totient is φ = 266945056386480.

The previous prime is 266949457123961. The next prime is 266949457124059. The reversal of 266949457123969 is 969321754949662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128419028812944 + 138530428311025 = 11332212^2 + 11769895^2 .

It is a cyclic number.

It is not a de Polignac number, because 266949457123969 - 2³ = 266949457123961 is a prime.

It is a super-2 number, since 2×266949457123969² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266949457123892 and 266949457123901.

It is not an unprimeable number, because it can be changed into a prime (266949457123961) 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 in 3 ways as a sum of consecutive naturals, for example, 2200277754 + ... + 2200399075.

It is an arithmetic number, because the mean of its divisors is an integer number (66738464465365).

Almost surely, 2^{266949457123969} is an apocalyptic number.

It is an amenable number.

266949457123969 is a deficient number, since it is larger than the sum of its proper divisors (4400737491).

266949457123969 is an equidigital number, since it uses as much as digits as its factorization.

266949457123969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400737490.

The product of its digits is 9523422720, while the sum is 82.

The spelling of 266949457123969 in words is "two hundred sixty-six trillion, nine hundred forty-nine billion, four hundred fifty-seven million, one hundred twenty-three thousand, nine hundred sixty-nine".