6638816147181 has 16 divisors (see below), whose sum is σ = 9372570768000. Its totient is φ = 4165476392448.

The previous prime is 6638816147081. The next prime is 6638816147191. The reversal of 6638816147181 is 1817416188366.

It is not a de Polignac number, because 6638816147181 - 2¹³ = 6638816138989 is a prime.

It is a super-2 number, since 2×6638816147181² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638816147191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3200145 + ... + 4849593.

It is an arithmetic number, because the mean of its divisors is an integer number (585785673000).

Almost surely, 2^{6638816147181} is an apocalyptic number.

It is an amenable number.

6638816147181 is a deficient number, since it is larger than the sum of its proper divisors (2733754620819).

6638816147181 is a wasteful number, since it uses less digits than its factorization.

6638816147181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728388.

The product of its digits is 9289728, while the sum is 60.

The spelling of 6638816147181 in words is "six trillion, six hundred thirty-eight billion, eight hundred sixteen million, one hundred forty-seven thousand, one hundred eighty-one".