10638405663 has 4 divisors (see below), whose sum is σ = 14184540888. Its totient is φ = 7092270440.

The previous prime is 10638405647. The next prime is 10638405667. The reversal of 10638405663 is 36650483601.

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

It is a cyclic number.

It is not a de Polignac number, because 10638405663 - 2⁴ = 10638405647 is a prime.

It is a super-2 number, since 2×10638405663² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10638405667) 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, 1773067608 + ... + 1773067613.

It is an arithmetic number, because the mean of its divisors is an integer number (3546135222).

Almost surely, 2^10638405663 is an apocalyptic number.

10638405663 is a deficient number, since it is larger than the sum of its proper divisors (3546135225).

10638405663 is an equidigital number, since it uses as much as digits as its factorization.

10638405663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546135224.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 10638405663 in words is "ten billion, six hundred thirty-eight million, four hundred five thousand, six hundred sixty-three".