6990000669 has 36 divisors (see below), whose sum is σ = 10485644988. Its totient is φ = 4483503360.

The previous prime is 6990000643. The next prime is 6990000671. The reversal of 6990000669 is 9660000996.

It can be written as a sum of positive squares in 2 ways, for example, as 2810378169 + 4179622500 = 53013^2 + 64650^2 .

It is not a de Polignac number, because 6990000669 - 2¹⁷ = 6989869597 is a prime.

It is a super-2 number, since 2×6990000669² = 97720218705240895122, which contains 22 as substring.

6990000669 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990007669) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16217884 + ... + 16218314.

Almost surely, 2^6990000669 is an apocalyptic number.

It is an amenable number.

6990000669 is a deficient number, since it is larger than the sum of its proper divisors (3495644319).

6990000669 is a wasteful number, since it uses less digits than its factorization.

6990000669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 6990000669 is about 83606.2238652123. The cubic root of 6990000669 is about 1912.0198900443.

The spelling of 6990000669 in words is "six billion, nine hundred ninety million, six hundred sixty-nine", and thus it is an aban number.