23209651905 has 64 divisors (see below), whose sum is σ = 41458231296. Its totient is φ = 11084568000.

The previous prime is 23209651903. The next prime is 23209651909. The reversal of 23209651905 is 50915690232.

It is not a de Polignac number, because 23209651905 - 2¹ = 23209651903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23209651903) 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 63 ways as a sum of consecutive naturals, for example, 1328980 + ... + 1346330.

It is an arithmetic number, because the mean of its divisors is an integer number (647784864).

Almost surely, 2^23209651905 is an apocalyptic number.

It is an amenable number.

23209651905 is a deficient number, since it is larger than the sum of its proper divisors (18248579391).

23209651905 is a wasteful number, since it uses less digits than its factorization.

23209651905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17459 (or 17437 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 42.

The spelling of 23209651905 in words is "twenty-three billion, two hundred nine million, six hundred fifty-one thousand, nine hundred five".