16551513761 has 4 divisors (see below), whose sum is σ = 16552137492. Its totient is φ = 16550890032.

The previous prime is 16551513743. The next prime is 16551513791. The reversal of 16551513761 is 16731515561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10346958400 + 6204555361 = 101720^2 + 78769^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551513761 - 2¹⁰ = 16551512737 is a prime.

It is a super-5 number, since 5×16551513761⁵ (a number of 52 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16551513721) 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, 270206 + ... + 325751.

It is an arithmetic number, because the mean of its divisors is an integer number (4138034373).

Almost surely, 2^16551513761 is an apocalyptic number.

It is an amenable number.

16551513761 is a deficient number, since it is larger than the sum of its proper divisors (623731).

16551513761 is an equidigital number, since it uses as much as digits as its factorization.

16551513761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623730.

The product of its digits is 94500, while the sum is 41.

The spelling of 16551513761 in words is "sixteen billion, five hundred fifty-one million, five hundred thirteen thousand, seven hundred sixty-one".