15666097697 has 8 divisors (see below), whose sum is σ = 15969660840. Its totient is φ = 15362830080.

The previous prime is 15666097637. The next prime is 15666097717. The reversal of 15666097697 is 79679066651.

15666097697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3819734416 + 11846363281 = 61804^2 + 108841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15666097697 - 2⁸ = 15666097441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15666097637) 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 7 ways as a sum of consecutive naturals, for example, 34697 + ... + 180377.

It is an arithmetic number, because the mean of its divisors is an integer number (1996207605).

Almost surely, 2^15666097697 is an apocalyptic number.

It is an amenable number.

15666097697 is a deficient number, since it is larger than the sum of its proper divisors (303563143).

15666097697 is a wasteful number, since it uses less digits than its factorization.

15666097697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147763.

The product of its (nonzero) digits is 25719120, while the sum is 62.

The spelling of 15666097697 in words is "fifteen billion, six hundred sixty-six million, ninety-seven thousand, six hundred ninety-seven".