266742507122091 has 64 divisors (see below), whose sum is σ = 530583386403840. Its totient is φ = 127908494910720.

The previous prime is 266742507122041. The next prime is 266742507122177. The reversal of 266742507122091 is 190221705247662.

It is a happy number.

266742507122091 is a `hidden beast` number, since 2 + 6 + 6 + 7 + 4 + 2 + 507 + 122 + 0 + 9 + 1 = 666.

It is not a de Polignac number, because 266742507122091 - 2⁷ = 266742507121963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266742507122041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4934714290 + ... + 4934768343.

It is an arithmetic number, because the mean of its divisors is an integer number (8290365412560).

Almost surely, 2^{266742507122091} is an apocalyptic number.

266742507122091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

266742507122091 is a deficient number, since it is larger than the sum of its proper divisors (263840879281749).

266742507122091 is a wasteful number, since it uses less digits than its factorization.

266742507122091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9869482673 (or 9869482667 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 266742507122091 in words is "two hundred sixty-six trillion, seven hundred forty-two billion, five hundred seven million, one hundred twenty-two thousand, ninety-one".