684690644903 has 2 divisors, whose sum is σ = 684690644904. Its totient is φ = 684690644902.

The previous prime is 684690644881. The next prime is 684690644917. The reversal of 684690644903 is 309446096486.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684690644903 - 2¹⁶ = 684690579367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684690674903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342345322451 + 342345322452.

It is an arithmetic number, because the mean of its divisors is an integer number (342345322452).

Almost surely, 2^684690644903 is an apocalyptic number.

684690644903 is a deficient number, since it is larger than the sum of its proper divisors (1).

684690644903 is an equidigital number, since it uses as much as digits as its factorization.

684690644903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26873856, while the sum is 59.

The spelling of 684690644903 in words is "six hundred eighty-four billion, six hundred ninety million, six hundred forty-four thousand, nine hundred three".