6638816212743 has 32 divisors (see below), whose sum is σ = 10405503988992. Its totient is φ = 3711794688000.

The previous prime is 6638816212667. The next prime is 6638816212747. The reversal of 6638816212743 is 3472126188366.

It is a happy number.

It is not a de Polignac number, because 6638816212743 - 2²⁰ = 6638815164167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638816212747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3926458 + ... + 5356743.

It is an arithmetic number, because the mean of its divisors is an integer number (325171999656).

Almost surely, 2^{6638816212743} is an apocalyptic number.

6638816212743 is a deficient number, since it is larger than the sum of its proper divisors (3766687776249).

6638816212743 is a wasteful number, since it uses less digits than its factorization.

6638816212743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9284895.

The product of its digits is 13934592, while the sum is 57.

The spelling of 6638816212743 in words is "six trillion, six hundred thirty-eight billion, eight hundred sixteen million, two hundred twelve thousand, seven hundred forty-three".