266340405 has 16 divisors (see below), whose sum is σ = 427933440. Its totient is φ = 141451968.

The previous prime is 266340401. The next prime is 266340407. The reversal of 266340405 is 504043662.

It is not a de Polignac number, because 266340405 - 2² = 266340401 is a prime.

It is a super-2 number, since 2×266340405² = 141874422671128050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266340401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33562 + ... + 40731.

It is an arithmetic number, because the mean of its divisors is an integer number (26745840).

Almost surely, 2^266340405 is an apocalyptic number.

It is an amenable number.

266340405 is a deficient number, since it is larger than the sum of its proper divisors (161593035).

266340405 is a wasteful number, since it uses less digits than its factorization.

266340405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74540.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 266340405 is about 16319.9388785620. The cubic root of 266340405 is about 643.3969807958.

The spelling of 266340405 in words is "two hundred sixty-six million, three hundred forty thousand, four hundred five".