663938504387 has 4 divisors (see below), whose sum is σ = 671937763560. Its totient is φ = 655939245216.

The previous prime is 663938504381. The next prime is 663938504393. The reversal of 663938504387 is 783405839366.

663938504387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (663938504381) and next prime (663938504393).

It is a cyclic number.

It is not a de Polignac number, because 663938504387 - 2²⁴ = 663921727171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663938504381) 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, 3999629462 + ... + 3999629627.

It is an arithmetic number, because the mean of its divisors is an integer number (167984440890).

Almost surely, 2^663938504387 is an apocalyptic number.

663938504387 is a deficient number, since it is larger than the sum of its proper divisors (7999259173).

663938504387 is an equidigital number, since it uses as much as digits as its factorization.

663938504387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7999259172.

The product of its (nonzero) digits is 78382080, while the sum is 62.

The spelling of 663938504387 in words is "six hundred sixty-three billion, nine hundred thirty-eight million, five hundred four thousand, three hundred eighty-seven".