16687536553 has 4 divisors (see below), whose sum is σ = 16961102788. Its totient is φ = 16413970320.

The previous prime is 16687536539. The next prime is 16687536563. The reversal of 16687536553 is 35563578661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35563578661 = 13 ⋅2735659897.

It can be written as a sum of positive squares in 2 ways, for example, as 177342489 + 16510194064 = 13317^2 + 128492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16687536553 is a prime.

It is a super-2 number, since 2×16687536553² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16687536494 and 16687536503.

It is not an unprimeable number, because it can be changed into a prime (16687536563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136783026 + ... + 136783147.

It is an arithmetic number, because the mean of its divisors is an integer number (4240275697).

Almost surely, 2^16687536553 is an apocalyptic number.

It is an amenable number.

16687536553 is a deficient number, since it is larger than the sum of its proper divisors (273566235).

16687536553 is an equidigital number, since it uses as much as digits as its factorization.

16687536553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273566234.

The product of its digits is 13608000, while the sum is 55.

The spelling of 16687536553 in words is "sixteen billion, six hundred eighty-seven million, five hundred thirty-six thousand, five hundred fifty-three".