15666317945 has 16 divisors (see below), whose sum is σ = 19441602048. Its totient is φ = 12106523520.

The previous prime is 15666317941. The next prime is 15666317951. The reversal of 15666317945 is 54971366651.

15666317945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15666317945 - 2² = 15666317941 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15666317941) by changing a digit.

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, 7604 + ... + 177173.

It is an arithmetic number, because the mean of its divisors is an integer number (1215100128).

Almost surely, 2^15666317945 is an apocalyptic number.

It is an amenable number.

15666317945 is a deficient number, since it is larger than the sum of its proper divisors (3775284103).

15666317945 is a wasteful number, since it uses less digits than its factorization.

15666317945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185360.

The product of its digits is 4082400, while the sum is 53.

The spelling of 15666317945 in words is "fifteen billion, six hundred sixty-six million, three hundred seventeen thousand, nine hundred forty-five".