1023666647 has 4 divisors (see below), whose sum is σ = 1024600896. Its totient is φ = 1022732400.

The previous prime is 1023666641. The next prime is 1023666653. The reversal of 1023666647 is 7466663201.

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

It is an interprime number because it is at equal distance from previous prime (1023666641) and next prime (1023666653).

It is a cyclic number.

It is not a de Polignac number, because 1023666647 - 2¹² = 1023662551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023666641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465479 + ... + 467672.

It is an arithmetic number, because the mean of its divisors is an integer number (256150224).

Almost surely, 2^1023666647 is an apocalyptic number.

1023666647 is a deficient number, since it is larger than the sum of its proper divisors (934249).

1023666647 is an equidigital number, since it uses as much as digits as its factorization.

1023666647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934248.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 1023666647 is about 31994.7909354007. The cubic root of 1023666647 is about 1007.8274534457.

The spelling of 1023666647 in words is "one billion, twenty-three million, six hundred sixty-six thousand, six hundred forty-seven".