266606421 has 4 divisors (see below), whose sum is σ = 355475232. Its totient is φ = 177737612.

The previous prime is 266606411. The next prime is 266606441. The reversal of 266606421 is 124606662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 266606421 - 2⁶ = 266606357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266606411) 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, 44434401 + ... + 44434406.

It is an arithmetic number, because the mean of its divisors is an integer number (88868808).

Almost surely, 2^266606421 is an apocalyptic number.

It is an amenable number.

266606421 is a deficient number, since it is larger than the sum of its proper divisors (88868811).

266606421 is an equidigital number, since it uses as much as digits as its factorization.

266606421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88868810.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 266606421 is about 16328.0868750751. The cubic root of 266606421 is about 643.6111139600.

The spelling of 266606421 in words is "two hundred sixty-six million, six hundred six thousand, four hundred twenty-one".