43218667881 has 15 divisors (see below), whose sum is σ = 64564015021. Its totient is φ = 28811197908.

The previous prime is 43218667879. The next prime is 43218667883. The reversal of 43218667881 is 18876681234.

The square root of 43218667881 is 207891.

It is a perfect power (a square), and thus also a powerful number.

43218667881 is a `hidden beast` number, since 432 + 1 + 8 + 66 + 78 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (43218667879) and next prime (43218667883).

It is not a de Polignac number, because 43218667881 - 2¹ = 43218667879 is a prime.

It is a super-2 number, since 2×43218667881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43218667883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1859470 + ... + 1882568.

Almost surely, 2^43218667881 is an apocalyptic number.

43218667881 is the 207891-st square number.

43218667881 is the 103946-th centered octagonal number.

It is an amenable number.

43218667881 is a deficient number, since it is larger than the sum of its proper divisors (21345347140).

43218667881 is an frugal number, since it uses more digits than its factorization.

43218667881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46210 (or 23102 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 43218667881 in words is "forty-three billion, two hundred eighteen million, six hundred sixty-seven thousand, eight hundred eighty-one".