8216754381 has 36 divisors (see below), whose sum is σ = 13813126236. Its totient is φ = 4686908160.

The previous prime is 8216754349. The next prime is 8216754419. The reversal of 8216754381 is 1834576128.

8216754381 is a `hidden beast` number, since 8 + 21 + 6 + 7 + 543 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4347292356 + 3869462025 = 65934^2 + 62205^2 .

It is not a de Polignac number, because 8216754381 - 2⁵ = 8216754349 is a prime.

It is a super-2 number, since 2×8216754381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216754311) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 203406 + ... + 240431.

It is an arithmetic number, because the mean of its divisors is an integer number (383697951).

Almost surely, 2^8216754381 is an apocalyptic number.

It is an amenable number.

8216754381 is a deficient number, since it is larger than the sum of its proper divisors (5596371855).

8216754381 is a wasteful number, since it uses less digits than its factorization.

8216754381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443882 (or 443868 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 8216754381 is about 90646.3147678933. The cubic root of 8216754381 is about 2017.9021435941.

The spelling of 8216754381 in words is "eight billion, two hundred sixteen million, seven hundred fifty-four thousand, three hundred eighty-one".