38666687218 has 8 divisors (see below), whose sum is σ = 60000031980. Its totient is φ = 18666676560.

The previous prime is 38666687201. The next prime is 38666687243. The reversal of 38666687218 is 81278666683.

It can be written as a sum of positive squares in 2 ways, for example, as 38630723209 + 35964009 = 196547^2 + 5997^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×38666687218² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333333453 + ... + 333333568.

Almost surely, 2^38666687218 is an apocalyptic number.

38666687218 is a deficient number, since it is larger than the sum of its proper divisors (21333344762).

38666687218 is a wasteful number, since it uses less digits than its factorization.

38666687218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666667052.

The product of its digits is 27869184, while the sum is 61.

The spelling of 38666687218 in words is "thirty-eight billion, six hundred sixty-six million, six hundred eighty-seven thousand, two hundred eighteen".