16565553315500 has 96 divisors (see below), whose sum is σ = 43145343940608. Its totient is φ = 5432678328000.

The previous prime is 16565553315469. The next prime is 16565553315503. The reversal of 16565553315500 is 551335556561.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (16565553315503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102811136 + ... + 102972135.

It is an arithmetic number, because the mean of its divisors is an integer number (449430666048).

Almost surely, 2^{16565553315500} is an apocalyptic number.

16565553315500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16565553315500 is an abundant number, since it is smaller than the sum of its proper divisors (26579790625108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16565553315500 is a wasteful number, since it uses less digits than its factorization.

16565553315500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205783320 (or 205783308 counting only the distinct ones).

The product of its (nonzero) digits is 5062500, while the sum is 50.

The spelling of 16565553315500 in words is "sixteen trillion, five hundred sixty-five billion, five hundred fifty-three million, three hundred fifteen thousand, five hundred".