266023161261 has 24 divisors (see below), whose sum is σ = 451433245536. Its totient is φ = 148824145440.

The previous prime is 266023161241. The next prime is 266023161329. The reversal of 266023161261 is 162161320662.

266023161261 is a `hidden beast` number, since 2 + 6 + 6 + 0 + 2 + 31 + 612 + 6 + 1 = 666.

It is not a de Polignac number, because 266023161261 - 2¹⁵ = 266023128493 is a prime.

It is a super-2 number, since 2×266023161261² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266023161221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103348815 + ... + 103351388.

It is an arithmetic number, because the mean of its divisors is an integer number (18809718564).

Almost surely, 2^266023161261 is an apocalyptic number.

It is an amenable number.

266023161261 is a deficient number, since it is larger than the sum of its proper divisors (185410084275).

266023161261 is a wasteful number, since it uses less digits than its factorization.

266023161261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206700233 (or 206700230 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 266023161261 in words is "two hundred sixty-six billion, twenty-three million, one hundred sixty-one thousand, two hundred sixty-one".