1000666525 has 12 divisors (see below), whose sum is σ = 1247068000. Its totient is φ = 796506480.

The previous prime is 1000666523. The next prime is 1000666549. The reversal of 1000666525 is 5256660001.

It is not a de Polignac number, because 1000666525 - 2¹ = 1000666523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000666523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95595 + ... + 105544.

Almost surely, 2^1000666525 is an apocalyptic number.

It is an amenable number.

1000666525 is a deficient number, since it is larger than the sum of its proper divisors (246401475).

1000666525 is a wasteful number, since it uses less digits than its factorization.

1000666525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201348 (or 201343 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1000666525 is about 31633.3135317816. The cubic root of 1000666525 is about 1000.2221256565. Note that the first 3 decimals are identical.

The spelling of 1000666525 in words is "one billion, six hundred sixty-six thousand, five hundred twenty-five".