16535804801 has 4 divisors (see below), whose sum is σ = 16847801172. Its totient is φ = 16223808432.

The previous prime is 16535804797. The next prime is 16535804827. The reversal of 16535804801 is 10840853561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10840853561 = 2447 ⋅4430263.

It can be written as a sum of positive squares in 2 ways, for example, as 14737960000 + 1797844801 = 121400^2 + 42401^2 .

It is a cyclic number.

It is not a de Polignac number, because 16535804801 - 2² = 16535804797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16535804881) 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, 155998106 + ... + 155998211.

It is an arithmetic number, because the mean of its divisors is an integer number (4211950293).

Almost surely, 2^16535804801 is an apocalyptic number.

It is an amenable number.

16535804801 is a deficient number, since it is larger than the sum of its proper divisors (311996371).

16535804801 is an equidigital number, since it uses as much as digits as its factorization.

16535804801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311996370.

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 16535804801 in words is "sixteen billion, five hundred thirty-five million, eight hundred four thousand, eight hundred one".