1638940513063 has 4 divisors (see below), whose sum is σ = 1873074872080. Its totient is φ = 1404806154048.

The previous prime is 1638940513037. The next prime is 1638940513081. The reversal of 1638940513063 is 3603150498361.

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 1638940513063 - 2⁹ = 1638940512551 is a prime.

It is a super-2 number, since 2×1638940513063² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1638940512998 and 1638940513016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638940513963) 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, 117067179498 + ... + 117067179511.

It is an arithmetic number, because the mean of its divisors is an integer number (468268718020).

Almost surely, 2^{1638940513063} is an apocalyptic number.

1638940513063 is a deficient number, since it is larger than the sum of its proper divisors (234134359017).

1638940513063 is an equidigital number, since it uses as much as digits as its factorization.

1638940513063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234134359016.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 1638940513063 in words is "one trillion, six hundred thirty-eight billion, nine hundred forty million, five hundred thirteen thousand, sixty-three".