2686171678 has 4 divisors (see below), whose sum is σ = 4029257520. Its totient is φ = 1343085838.

The previous prime is 2686171673. The next prime is 2686171681. The reversal of 2686171678 is 8761716862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8761716862 = 2 ⋅4380858431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686171673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671542918 + ... + 671542921.

It is an arithmetic number, because the mean of its divisors is an integer number (1007314380).

Almost surely, 2^2686171678 is an apocalyptic number.

2686171678 is a deficient number, since it is larger than the sum of its proper divisors (1343085842).

2686171678 is a wasteful number, since it uses less digits than its factorization.

2686171678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343085841.

The product of its digits is 1354752, while the sum is 52.

The square root of 2686171678 is about 51828.2903248795. The cubic root of 2686171678 is about 1390.0953435971.

The spelling of 2686171678 in words is "two billion, six hundred eighty-six million, one hundred seventy-one thousand, six hundred seventy-eight".