658947749821 has 2 divisors, whose sum is σ = 658947749822. Its totient is φ = 658947749820.

The previous prime is 658947749819. The next prime is 658947749857. The reversal of 658947749821 is 128947749856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657622061721 + 1325688100 = 810939^2 + 36410^2 .

It is a cyclic number.

It is not a de Polignac number, because 658947749821 - 2¹ = 658947749819 is a prime.

Together with 658947749819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (658947749891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329473874910 + 329473874911.

It is an arithmetic number, because the mean of its divisors is an integer number (329473874911).

Almost surely, 2^658947749821 is an apocalyptic number.

It is an amenable number.

658947749821 is a deficient number, since it is larger than the sum of its proper divisors (1).

658947749821 is an equidigital number, since it uses as much as digits as its factorization.

658947749821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243855360, while the sum is 70.

The spelling of 658947749821 in words is "six hundred fifty-eight billion, nine hundred forty-seven million, seven hundred forty-nine thousand, eight hundred twenty-one".