6691986122 has 4 divisors (see below), whose sum is σ = 10037979186. Its totient is φ = 3345993060.

The previous prime is 6691986121. The next prime is 6691986127. The reversal of 6691986122 is 2216891966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6638827441 + 53158681 = 81479^2 + 7291^2 .

It is not an unprimeable number, because it can be changed into a prime (6691986121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1672996529 + ... + 1672996532.

Almost surely, 2^6691986122 is an apocalyptic number.

6691986122 is a deficient number, since it is larger than the sum of its proper divisors (3345993064).

6691986122 is a wasteful number, since it uses less digits than its factorization.

6691986122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3345993063.

The product of its digits is 559872, while the sum is 50.

The square root of 6691986122 is about 81804.5605207925. The cubic root of 6691986122 is about 1884.4516997079.

The spelling of 6691986122 in words is "six billion, six hundred ninety-one million, nine hundred eighty-six thousand, one hundred twenty-two".