8168434044637 has 4 divisors (see below), whose sum is σ = 8168461368156. Its totient is φ = 8168406721120.

The previous prime is 8168434044599. The next prime is 8168434044677. The reversal of 8168434044637 is 7364404348618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 518153789241 + 7650280255396 = 719829^2 + 2765914^2 .

It is a cyclic number.

It is not a de Polignac number, because 8168434044637 - 2³¹ = 8166286560989 is a prime.

It is a super-3 number, since 3×8168434044637³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8168434044677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13208314 + ... + 13812907.

It is an arithmetic number, because the mean of its divisors is an integer number (2042115342039).

Almost surely, 2^{8168434044637} is an apocalyptic number.

It is an amenable number.

8168434044637 is a deficient number, since it is larger than the sum of its proper divisors (27323519).

8168434044637 is a wasteful number, since it uses less digits than its factorization.

8168434044637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27323518.

The product of its (nonzero) digits is 37158912, while the sum is 58.

The spelling of 8168434044637 in words is "eight trillion, one hundred sixty-eight billion, four hundred thirty-four million, forty-four thousand, six hundred thirty-seven".