6918168644 has 12 divisors (see below), whose sum is σ = 12107409468. Its totient is φ = 3458908800.

The previous prime is 6918168629. The next prime is 6918168659. The reversal of 6918168644 is 4468618196.

It is an interprime number because it is at equal distance from previous prime (6918168629) and next prime (6918168659).

It can be written as a sum of positive squares in 2 ways, for example, as 436308544 + 6481860100 = 20888^2 + 80510^2 .

It is a super-3 number, since 3×6918168644³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90584 + ... + 148464.

It is an arithmetic number, because the mean of its divisors is an integer number (1008950789).

Almost surely, 2^6918168644 is an apocalyptic number.

It is an amenable number.

6918168644 is a deficient number, since it is larger than the sum of its proper divisors (5189240824).

6918168644 is a wasteful number, since it uses less digits than its factorization.

6918168644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87766 (or 87764 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 53.

The square root of 6918168644 is about 83175.5291176437. The cubic root of 6918168644 is about 1905.4477670154.

The spelling of 6918168644 in words is "six billion, nine hundred eighteen million, one hundred sixty-eight thousand, six hundred forty-four".