6990220997 has 8 divisors (see below), whose sum is σ = 7163868096. Its totient is φ = 6817077792.

The previous prime is 6990220957. The next prime is 6990221003. The reversal of 6990220997 is 7990220996.

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

It is a cyclic number.

It is not a de Polignac number, because 6990220997 - 2¹² = 6990216901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990220957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97808 + ... + 153449.

It is an arithmetic number, because the mean of its divisors is an integer number (895483512).

Almost surely, 2^6990220997 is an apocalyptic number.

It is an amenable number.

6990220997 is a deficient number, since it is larger than the sum of its proper divisors (173647099).

6990220997 is a wasteful number, since it uses less digits than its factorization.

6990220997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251947.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 6990220997 is about 83607.5415079286. The cubic root of 6990220997 is about 1912.0399790788.

Subtracting 6990220997 from its reverse (7990220996), we obtain a palindrome (999999999).

The spelling of 6990220997 in words is "six billion, nine hundred ninety million, two hundred twenty thousand, nine hundred ninety-seven".