1306648663 has 4 divisors (see below), whose sum is σ = 1306720960. Its totient is φ = 1306576368.

The previous prime is 1306648661. The next prime is 1306648687. The reversal of 1306648663 is 3668466031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1306648663 - 2¹ = 1306648661 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 (1306648661) 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, 17818 + ... + 54136.

It is an arithmetic number, because the mean of its divisors is an integer number (326680240).

Almost surely, 2^1306648663 is an apocalyptic number.

1306648663 is a deficient number, since it is larger than the sum of its proper divisors (72297).

1306648663 is an equidigital number, since it uses as much as digits as its factorization.

1306648663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72296.

The product of its (nonzero) digits is 373248, while the sum is 43.

The square root of 1306648663 is about 36147.5955355263. The cubic root of 1306648663 is about 1093.2503107711.

The spelling of 1306648663 in words is "one billion, three hundred six million, six hundred forty-eight thousand, six hundred sixty-three".