16623654449 has 4 divisors (see below), whose sum is σ = 16689884400. Its totient is φ = 16557424500.

The previous prime is 16623654433. The next prime is 16623654469. The reversal of 16623654449 is 94445632661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94445632661 = 607 ⋅155594123.

It is a cyclic number.

It is not a de Polignac number, because 16623654449 - 2⁴ = 16623654433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16623654397 and 16623654406.

It is not an unprimeable number, because it can be changed into a prime (16623654469) 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, 33114599 + ... + 33115100.

It is an arithmetic number, because the mean of its divisors is an integer number (4172471100).

Almost surely, 2^16623654449 is an apocalyptic number.

It is an amenable number.

16623654449 is a deficient number, since it is larger than the sum of its proper divisors (66229951).

16623654449 is an equidigital number, since it uses as much as digits as its factorization.

16623654449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66229950.

The product of its digits is 3732480, while the sum is 50.

The spelling of 16623654449 in words is "sixteen billion, six hundred twenty-three million, six hundred fifty-four thousand, four hundred forty-nine".