1025666663 has 8 divisors (see below), whose sum is σ = 1172387328. Its totient is φ = 878995224.

The previous prime is 1025666641. The next prime is 1025666689. The reversal of 1025666663 is 3666665201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1025666663 - 2¹⁸ = 1025404519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1025666663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025666363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63470 + ... + 77972.

It is an arithmetic number, because the mean of its divisors is an integer number (146548416).

Almost surely, 2^1025666663 is an apocalyptic number.

1025666663 is a deficient number, since it is larger than the sum of its proper divisors (146720665).

1025666663 is a wasteful number, since it uses less digits than its factorization.

1025666663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24613.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 1025666663 is about 32026.0310216549. The cubic root of 1025666663 is about 1008.4833830355.

The spelling of 1025666663 in words is "one billion, twenty-five million, six hundred sixty-six thousand, six hundred sixty-three".