8136542178 has 90 divisors (see below), whose sum is σ = 19293683409. Its totient is φ = 2562545808.

The previous prime is 8136542153. The next prime is 8136542189. The reversal of 8136542178 is 8712456318.

8136542178 is a `hidden beast` number, since 8 + 1 + 36 + 542 + 1 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8121073689 + 15468489 = 90117^2 + 3933^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=63783.

It is a super-2 number, since 2×8136542178² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 21813600 + ... + 21813972.

Almost surely, 2^8136542178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8136542178

8136542178 is an abundant number, since it is smaller than the sum of its proper divisors (11157141231).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8136542178 is an equidigital number, since it uses as much as digits as its factorization.

8136542178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 397 counting only the distinct ones).

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

The square root of 8136542178 is about 90202.7836488431. The cubic root of 8136542178 is about 2011.3143864616.

The spelling of 8136542178 in words is "eight billion, one hundred thirty-six million, five hundred forty-two thousand, one hundred seventy-eight".