690666047 has 2 divisors, whose sum is σ = 690666048. Its totient is φ = 690666046.

The previous prime is 690666029. The next prime is 690666127. The reversal of 690666047 is 740666096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690666047 - 2²⁰ = 689617471 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 690665989 and 690666007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690666547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345333023 + 345333024.

It is an arithmetic number, because the mean of its divisors is an integer number (345333024).

Almost surely, 2^690666047 is an apocalyptic number.

690666047 is a deficient number, since it is larger than the sum of its proper divisors (1).

690666047 is an equidigital number, since it uses as much as digits as its factorization.

690666047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 690666047 is about 26280.5260031073. The cubic root of 690666047 is about 883.9398274495.

The spelling of 690666047 in words is "six hundred ninety million, six hundred sixty-six thousand, forty-seven".