1658421113209 has 9 divisors (see below), whose sum is σ = 1929194230341. Its totient is φ = 1421496084540.

The previous prime is 1658421113203. The next prime is 1658421113249. The reversal of 1658421113209 is 9023111248561.

The square root of 1658421113209 is 1287797.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1658421113209 - 2¹¹ = 1658421111161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1658421113203) 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 8 ways as a sum of consecutive naturals, for example, 8922594 + ... + 9106564.

Almost surely, 2^{1658421113209} is an apocalyptic number.

1658421113209 is the 1287797-th square number.

1658421113209 is the 643899-th centered octagonal number.

It is an amenable number.

1658421113209 is a deficient number, since it is larger than the sum of its proper divisors (270773117132).

1658421113209 is an frugal number, since it uses more digits than its factorization.

1658421113209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367956 (or 183978 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 1658421113209 in words is "one trillion, six hundred fifty-eight billion, four hundred twenty-one million, one hundred thirteen thousand, two hundred nine".