6690919321 has 2 divisors, whose sum is σ = 6690919322. Its totient is φ = 6690919320.

The previous prime is 6690919303. The next prime is 6690919349. The reversal of 6690919321 is 1239190966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6390243721 + 300675600 = 79939^2 + 17340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6690919321 is a prime.

It is a super-2 number, since 2×6690919321² = 89536802720262202082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6690929321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345459660 + 3345459661.

It is an arithmetic number, because the mean of its divisors is an integer number (3345459661).

Almost surely, 2^6690919321 is an apocalyptic number.

It is an amenable number.

6690919321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6690919321 is an equidigital number, since it uses as much as digits as its factorization.

6690919321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 6690919321 is about 81798.0398359276. The cubic root of 6690919321 is about 1884.3515579485.

The spelling of 6690919321 in words is "six billion, six hundred ninety million, nine hundred nineteen thousand, three hundred twenty-one".