1000665266 has 4 divisors (see below), whose sum is σ = 1500997902. Its totient is φ = 500332632.

The previous prime is 1000665257. The next prime is 1000665269. The reversal of 1000665266 is 6625660001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 631064641 + 369600625 = 25121^2 + 19225^2 .

It is not an unprimeable number, because it can be changed into a prime (1000665269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250166315 + ... + 250166318.

Almost surely, 2^1000665266 is an apocalyptic number.

1000665266 is a deficient number, since it is larger than the sum of its proper divisors (500332636).

1000665266 is an equidigital number, since it uses as much as digits as its factorization.

1000665266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500332635.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1000665266 is about 31633.2936318683. The cubic root of 1000665266 is about 1000.2217061761.

The spelling of 1000665266 in words is "one billion, six hundred sixty-five thousand, two hundred sixty-six".