6918647156 has 24 divisors (see below), whose sum is σ = 12748723680. Its totient is φ = 3276264672.

The previous prime is 6918647149. The next prime is 6918647159. The reversal of 6918647156 is 6517468196.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6918647098 and 6918647107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6918647159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281015 + ... + 304641.

It is an arithmetic number, because the mean of its divisors is an integer number (531196820).

Almost surely, 2^6918647156 is an apocalyptic number.

It is an amenable number.

6918647156 is a deficient number, since it is larger than the sum of its proper divisors (5830076524).

6918647156 is a wasteful number, since it uses less digits than its factorization.

6918647156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27503 (or 27501 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 53.

The square root of 6918647156 is about 83178.4055870272. The cubic root of 6918647156 is about 1905.4916976493.

The spelling of 6918647156 in words is "six billion, nine hundred eighteen million, six hundred forty-seven thousand, one hundred fifty-six".