15812205665 has 32 divisors (see below), whose sum is σ = 20216376576. Its totient is φ = 11831500800.

The previous prime is 15812205649. The next prime is 15812205671. The reversal of 15812205665 is 56650221851.

It is not a de Polignac number, because 15812205665 - 2⁴ = 15812205649 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 15044390 + ... + 15045440.

It is an arithmetic number, because the mean of its divisors is an integer number (631761768).

Almost surely, 2^15812205665 is an apocalyptic number.

It is an amenable number.

15812205665 is a deficient number, since it is larger than the sum of its proper divisors (4404170911).

15812205665 is a wasteful number, since it uses less digits than its factorization.

15812205665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009.

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 15812205665 in words is "fifteen billion, eight hundred twelve million, two hundred five thousand, six hundred sixty-five".