266402385 has 32 divisors (see below), whose sum is σ = 480689280. Its totient is φ = 139955904.

The previous prime is 266402377. The next prime is 266402429. The reversal of 266402385 is 583204662.

266402385 is a `hidden beast` number, since 2 + 6 + 640 + 2 + 3 + 8 + 5 = 666.

It is not a de Polignac number, because 266402385 - 2³ = 266402377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5682 + ... + 23771.

It is an arithmetic number, because the mean of its divisors is an integer number (15021540).

Almost surely, 2^266402385 is an apocalyptic number.

It is an amenable number.

266402385 is a deficient number, since it is larger than the sum of its proper divisors (214286895).

266402385 is a wasteful number, since it uses less digits than its factorization.

266402385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29534 (or 29528 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 266402385 is about 16321.8376722721. The cubic root of 266402385 is about 643.4468851678.

The spelling of 266402385 in words is "two hundred sixty-six million, four hundred two thousand, three hundred eighty-five".