15816669697 has 4 divisors (see below), whose sum is σ = 15829233840. Its totient is φ = 15804105556.

The previous prime is 15816669679. The next prime is 15816669721. The reversal of 15816669697 is 79696661851.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79696661851 = 197 ⋅404551583.

It is a cyclic number.

It is not a de Polignac number, because 15816669697 - 2⁷ = 15816669569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15816669677) 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 3 ways as a sum of consecutive naturals, for example, 6280183 + ... + 6282700.

It is an arithmetic number, because the mean of its divisors is an integer number (3957308460).

Almost surely, 2^15816669697 is an apocalyptic number.

It is an amenable number.

15816669697 is a deficient number, since it is larger than the sum of its proper divisors (12564143).

15816669697 is a wasteful number, since it uses less digits than its factorization.

15816669697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12564142.

The product of its digits is 29393280, while the sum is 64.

The spelling of 15816669697 in words is "fifteen billion, eight hundred sixteen million, six hundred sixty-nine thousand, six hundred ninety-seven".