266800057 has 4 divisors (see below), whose sum is σ = 282494196. Its totient is φ = 251105920.

The previous prime is 266800021. The next prime is 266800073. The reversal of 266800057 is 750008662.

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 87534736 + 179265321 = 9356^2 + 13389^2 .

It is a cyclic number.

It is not a de Polignac number, because 266800057 - 2¹⁵ = 266767289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266799995 and 266800031.

It is not an unprimeable number, because it can be changed into a prime (266800657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7847044 + ... + 7847077.

It is an arithmetic number, because the mean of its divisors is an integer number (70623549).

Almost surely, 2^266800057 is an apocalyptic number.

It is an amenable number.

266800057 is a deficient number, since it is larger than the sum of its proper divisors (15694139).

266800057 is a wasteful number, since it uses less digits than its factorization.

266800057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15694138.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 266800057 is about 16334.0153361015. The cubic root of 266800057 is about 643.7668943064.

The spelling of 266800057 in words is "two hundred sixty-six million, eight hundred thousand, fifty-seven".