6690306551 has 2 divisors, whose sum is σ = 6690306552. Its totient is φ = 6690306550.

The previous prime is 6690306541. The next prime is 6690306607. The reversal of 6690306551 is 1556030966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6690306551 - 2³⁰ = 5616564727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6690306499 and 6690306508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6690306521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345153275 + 3345153276.

It is an arithmetic number, because the mean of its divisors is an integer number (3345153276).

Almost surely, 2^6690306551 is an apocalyptic number.

6690306551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6690306551 is an equidigital number, since it uses as much as digits as its factorization.

6690306551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 6690306551 is about 81794.2941225120. The cubic root of 6690306551 is about 1884.2940317552.

The spelling of 6690306551 in words is "six billion, six hundred ninety million, three hundred six thousand, five hundred fifty-one".