16654577617 has 4 divisors (see below), whose sum is σ = 16656405556. Its totient is φ = 16652749680.

The previous prime is 16654577581. The next prime is 16654577683. The reversal of 16654577617 is 71677545661.

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 6549503041 + 10105074576 = 80929^2 + 100524^2 .

It is a cyclic number.

It is not a de Polignac number, because 16654577617 - 2³¹ = 14507093969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16654577117) 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, 900234 + ... + 918547.

It is an arithmetic number, because the mean of its divisors is an integer number (4164101389).

Almost surely, 2^16654577617 is an apocalyptic number.

It is an amenable number.

16654577617 is a deficient number, since it is larger than the sum of its proper divisors (1827939).

16654577617 is an equidigital number, since it uses as much as digits as its factorization.

16654577617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827938.

The product of its digits is 7408800, while the sum is 55.

The spelling of 16654577617 in words is "sixteen billion, six hundred fifty-four million, five hundred seventy-seven thousand, six hundred seventeen".