6918868136 has 8 divisors (see below), whose sum is σ = 12972877770. Its totient is φ = 3459434064.

The previous prime is 6918868127. The next prime is 6918868147. The reversal of 6918868136 is 6318688196.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4224220036 + 2694648100 = 64994^2 + 51910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×6918868136² = 95741472566712228992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432429251 + ... + 432429266.

Almost surely, 2^6918868136 is an apocalyptic number.

It is an amenable number.

6918868136 is a deficient number, since it is larger than the sum of its proper divisors (6054009634).

6918868136 is a wasteful number, since it uses less digits than its factorization.

6918868136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864858523 (or 864858519 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 56.

The square root of 6918868136 is about 83179.7339259991. The cubic root of 6918868136 is about 1905.5119844223.

The spelling of 6918868136 in words is "six billion, nine hundred eighteen million, eight hundred sixty-eight thousand, one hundred thirty-six".