1665535266 has 48 divisors (see below), whose sum is σ = 3633664320. Its totient is φ = 551348640.

The previous prime is 1665535247. The next prime is 1665535283. The reversal of 1665535266 is 6625355661.

1665535266 is a `hidden beast` number, since 16 + 65 + 53 + 526 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2409981 + ... + 2410671.

It is an arithmetic number, because the mean of its divisors is an integer number (75701340).

Almost surely, 2^1665535266 is an apocalyptic number.

1665535266 is an abundant number, since it is smaller than the sum of its proper divisors (1968129054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665535266 is a wasteful number, since it uses less digits than its factorization.

1665535266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431 (or 1428 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 1665535266 is about 40810.9699223138. The cubic root of 1665535266 is about 1185.3627560025.

The spelling of 1665535266 in words is "one billion, six hundred sixty-five million, five hundred thirty-five thousand, two hundred sixty-six".