658368649 has 2 divisors, whose sum is σ = 658368650. Its totient is φ = 658368648.

The previous prime is 658368647. The next prime is 658368709. The reversal of 658368649 is 946863856.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647346249 + 11022400 = 25443^2 + 3320^2 .

It is a cyclic number.

It is not a de Polignac number, because 658368649 - 2¹ = 658368647 is a prime.

Together with 658368647, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 658368649.

It is not a weakly prime, because it can be changed into another prime (658368647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329184324 + 329184325.

It is an arithmetic number, because the mean of its divisors is an integer number (329184325).

Almost surely, 2^658368649 is an apocalyptic number.

It is an amenable number.

658368649 is a deficient number, since it is larger than the sum of its proper divisors (1).

658368649 is an equidigital number, since it uses as much as digits as its factorization.

658368649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 55.

The square root of 658368649 is about 25658.6953877238. The cubic root of 658368649 is about 869.9408287585.

The spelling of 658368649 in words is "six hundred fifty-eight million, three hundred sixty-eight thousand, six hundred forty-nine".