12858879609 has 9 divisors (see below), whose sum is σ = 18574428613. Its totient is φ = 8572359612.

The previous prime is 12858879599. The next prime is 12858879617. The reversal of 12858879609 is 90697885821.

It is a happy number.

The square root of 12858879609 is 113397.

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

12858879609 is a `hidden beast` number, since 12 + 8 + 5 + 8 + 8 + 7 + 9 + 609 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 12858879609 - 2⁹ = 12858879097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12858879809) 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 in 8 ways as a sum of consecutive naturals, for example, 321292 + ... + 359090.

Almost surely, 2^12858879609 is an apocalyptic number.

12858879609 is the 113397-th square number.

12858879609 is the 56699-th centered octagonal number.

It is an amenable number.

12858879609 is a deficient number, since it is larger than the sum of its proper divisors (5715549004).

12858879609 is an frugal number, since it uses more digits than its factorization.

12858879609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75604 (or 37802 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 63.

The spelling of 12858879609 in words is "twelve billion, eight hundred fifty-eight million, eight hundred seventy-nine thousand, six hundred nine".