16664549697 has 48 divisors (see below), whose sum is σ = 26588390400. Its totient is φ = 10010705760.

The previous prime is 16664549687. The next prime is 16664549723. The reversal of 16664549697 is 79694546661.

It is not a de Polignac number, because 16664549697 - 2²⁰ = 16663501121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16664549687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 692172 + ... + 715842.

It is an arithmetic number, because the mean of its divisors is an integer number (553924800).

Almost surely, 2^16664549697 is an apocalyptic number.

It is an amenable number.

16664549697 is a deficient number, since it is larger than the sum of its proper divisors (9923840703).

16664549697 is a wasteful number, since it uses less digits than its factorization.

16664549697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23898 (or 23895 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The spelling of 16664549697 in words is "sixteen billion, six hundred sixty-four million, five hundred forty-nine thousand, six hundred ninety-seven".