658218961 has 16 divisors (see below), whose sum is σ = 682577280. Its totient is φ = 634318720.

The previous prime is 658218947. The next prime is 658218983. The reversal of 658218961 is 169812856.

It is a cyclic number.

It is not a de Polignac number, because 658218961 - 2⁵ = 658218929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (658218941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1833300 + ... + 1833658.

It is an arithmetic number, because the mean of its divisors is an integer number (42661080).

Almost surely, 2^658218961 is an apocalyptic number.

It is an amenable number.

658218961 is a deficient number, since it is larger than the sum of its proper divisors (24358319).

658218961 is a wasteful number, since it uses less digits than its factorization.

658218961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824.

The product of its digits is 207360, while the sum is 46.

The square root of 658218961 is about 25655.7783160051. The cubic root of 658218961 is about 869.8748932713.

The spelling of 658218961 in words is "six hundred fifty-eight million, two hundred eighteen thousand, nine hundred sixty-one".