6918788564 has 18 divisors (see below), whose sum is σ = 12527015130. Its totient is φ = 3339672336.

The previous prime is 6918788507. The next prime is 6918788579. The reversal of 6918788564 is 4658878196.

It can be written as a sum of positive squares in only one way, i.e., 5964472900 + 954315664 = 77230^2 + 30892^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6918788497 and 6918788506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 892007 + ... + 899729.

It is an arithmetic number, because the mean of its divisors is an integer number (695945285).

Almost surely, 2^6918788564 is an apocalyptic number.

It is an amenable number.

6918788564 is a deficient number, since it is larger than the sum of its proper divisors (5608226566).

6918788564 is an frugal number, since it uses more digits than its factorization.

6918788564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15479 (or 7754 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 62.

The square root of 6918788564 is about 83179.2556109995. The cubic root of 6918788564 is about 1905.5046794711.

It can be divided in two parts, 69187 and 88564, that added together give a palindrome (157751).

The spelling of 6918788564 in words is "six billion, nine hundred eighteen million, seven hundred eighty-eight thousand, five hundred sixty-four".