8143694905 has 8 divisors (see below), whose sum is σ = 10010786184. Its totient is φ = 6356054400.

The previous prime is 8143694903. The next prime is 8143694921. The reversal of 8143694905 is 5094963418.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 91145209 + 8052549696 = 9547^2 + 89736^2 .

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

It is not a de Polignac number, because 8143694905 - 2¹ = 8143694903 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8143694903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19862466 + ... + 19862875.

It is an arithmetic number, because the mean of its divisors is an integer number (1251348273).

Almost surely, 2^8143694905 is an apocalyptic number.

It is an amenable number.

8143694905 is a deficient number, since it is larger than the sum of its proper divisors (1867091279).

8143694905 is a wasteful number, since it uses less digits than its factorization.

8143694905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39725387.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 8143694905 is about 90242.4229783310. The cubic root of 8143694905 is about 2011.9035871660.

The spelling of 8143694905 in words is "eight billion, one hundred forty-three million, six hundred ninety-four thousand, nine hundred five".