6991437632 has 42 divisors (see below), whose sum is σ = 13960770402. Its totient is φ = 3473899264.

The previous prime is 6991437617. The next prime is 6991437647. The reversal of 6991437632 is 2367341996.

It is an interprime number because it is at equal distance from previous prime (6991437617) and next prime (6991437647).

It can be written as a sum of positive squares in only one way, i.e., 6641598016 + 349839616 = 81496^2 + 18704^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1782938 + ... + 1786854.

Almost surely, 2^6991437632 is an apocalyptic number.

It is an amenable number.

6991437632 is a deficient number, since it is larger than the sum of its proper divisors (6969332770).

6991437632 is an equidigital number, since it uses as much as digits as its factorization.

6991437632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4263 (or 4086 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 50.

The square root of 6991437632 is about 83614.8170601359. The cubic root of 6991437632 is about 1912.1509016478.

The spelling of 6991437632 in words is "six billion, nine hundred ninety-one million, four hundred thirty-seven thousand, six hundred thirty-two".