16551204663404 has 72 divisors (see below), whose sum is σ = 30679424848800. Its totient is φ = 7811833197312.

The previous prime is 16551204663401. The next prime is 16551204663407. The reversal of 16551204663404 is 40436640215561.

It is an interprime number because it is at equal distance from previous prime (16551204663401) and next prime (16551204663407).

It is not an unprimeable number, because it can be changed into a prime (16551204663401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 729212984 + ... + 729235680.

It is an arithmetic number, because the mean of its divisors is an integer number (426103122900).

Almost surely, 2^{16551204663404} is an apocalyptic number.

It is an amenable number.

16551204663404 is a deficient number, since it is larger than the sum of its proper divisors (14128220185396).

16551204663404 is a wasteful number, since it uses less digits than its factorization.

16551204663404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24535 (or 24514 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 47.

Adding to 16551204663404 its reverse (40436640215561), we get a palindrome (56987844878965).

The spelling of 16551204663404 in words is "sixteen trillion, five hundred fifty-one billion, two hundred four million, six hundred sixty-three thousand, four hundred four".