16645464247 has 4 divisors (see below), whose sum is σ = 16807070800. Its totient is φ = 16483857696.

The previous prime is 16645464233. The next prime is 16645464259. The reversal of 16645464247 is 74246454661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74246454661 = 40819 ⋅1818919.

It is a cyclic number.

It is not a de Polignac number, because 16645464247 - 2³¹ = 14497980599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16645464247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645465247) 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, 80803122 + ... + 80803327.

It is an arithmetic number, because the mean of its divisors is an integer number (4201767700).

Almost surely, 2^16645464247 is an apocalyptic number.

16645464247 is a deficient number, since it is larger than the sum of its proper divisors (161606553).

16645464247 is a wasteful number, since it uses less digits than its factorization.

16645464247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161606552.

The product of its digits is 3870720, while the sum is 49.

The spelling of 16645464247 in words is "sixteen billion, six hundred forty-five million, four hundred sixty-four thousand, two hundred forty-seven".