5178816646 has 8 divisors (see below), whose sum is σ = 7769132280. Its totient is φ = 2589105888.

The previous prime is 5178816493. The next prime is 5178816647. The reversal of 5178816646 is 6466188715.

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

It is a junction number, because it is equal to n+sod(n) for n = 5178816593 and 5178816602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5178816647) 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, 129171 + ... + 164446.

It is an arithmetic number, because the mean of its divisors is an integer number (971141535).

Almost surely, 2^5178816646 is an apocalyptic number.

5178816646 is a deficient number, since it is larger than the sum of its proper divisors (2590315634).

5178816646 is a wasteful number, since it uses less digits than its factorization.

5178816646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302438.

The product of its digits is 1935360, while the sum is 52.

The square root of 5178816646 is about 71963.9954838529. The cubic root of 5178816646 is about 1730.1224640718.

The spelling of 5178816646 in words is "five billion, one hundred seventy-eight million, eight hundred sixteen thousand, six hundred forty-six".