7666742218 has 8 divisors (see below), whose sum is σ = 11657649348. Its totient is φ = 3780859104.

The previous prime is 7666742207. The next prime is 7666742299. The reversal of 7666742218 is 8122476667.

It can be written as a sum of positive squares in 2 ways, for example, as 7056504009 + 610238209 = 84003^2 + 24703^2 .

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

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, 26255821 + ... + 26256112.

Almost surely, 2^7666742218 is an apocalyptic number.

7666742218 is a deficient number, since it is larger than the sum of its proper divisors (3990907130).

7666742218 is a wasteful number, since it uses less digits than its factorization.

7666742218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52512008.

The product of its digits is 1354752, while the sum is 49.

The square root of 7666742218 is about 87559.9350045442. The cubic root of 7666742218 is about 1971.8337103504.

The spelling of 7666742218 in words is "seven billion, six hundred sixty-six million, seven hundred forty-two thousand, two hundred eighteen".