23405906505 has 16 divisors (see below), whose sum is σ = 37976909184. Its totient is φ = 12307330560.

The previous prime is 23405906497. The next prime is 23405906519. The reversal of 23405906505 is 50560950432.

It is not a de Polignac number, because 23405906505 - 2³ = 23405906497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10987624 + ... + 10989753.

It is an arithmetic number, because the mean of its divisors is an integer number (2373556824).

Almost surely, 2^23405906505 is an apocalyptic number.

It is an amenable number.

23405906505 is a deficient number, since it is larger than the sum of its proper divisors (14571002679).

23405906505 is a wasteful number, since it uses less digits than its factorization.

23405906505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21977456.

The product of its (nonzero) digits is 162000, while the sum is 39.

The spelling of 23405906505 in words is "twenty-three billion, four hundred five million, nine hundred six thousand, five hundred five".