16704501997 has 4 divisors (see below), whose sum is σ = 16704765820. Its totient is φ = 16704238176.

The previous prime is 16704501977. The next prime is 16704502007. The reversal of 16704501997 is 79910540761.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7452178276 + 9252323721 = 86326^2 + 96189^2 .

It is a 3-Lehmer number, since φ(16704501997) divides (16704501997-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16704501997 is a prime.

It is a deceptive number, since it divides R_16704501996.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16704501997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16704501967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26383 + ... + 184675.

It is an arithmetic number, because the mean of its divisors is an integer number (4176191455).

Almost surely, 2^16704501997 is an apocalyptic number.

16704501997 is the 105529-th pentagonal number.

It is an amenable number.

16704501997 is a deficient number, since it is larger than the sum of its proper divisors (263823).

16704501997 is a wasteful number, since it uses less digits than its factorization.

16704501997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263822.

The product of its (nonzero) digits is 476280, while the sum is 49.

The spelling of 16704501997 in words is "sixteen billion, seven hundred four million, five hundred one thousand, nine hundred ninety-seven".