16645074391 has 8 divisors (see below), whose sum is σ = 19226396304. Its totient is φ = 14241774720.

The previous prime is 16645074389. The next prime is 16645074403. The reversal of 16645074391 is 19347054661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16645074391 - 2¹ = 16645074389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645074361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44505360 + ... + 44505733.

It is an arithmetic number, because the mean of its divisors is an integer number (2403299538).

Almost surely, 2^16645074391 is an apocalyptic number.

16645074391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16645074391 is a deficient number, since it is larger than the sum of its proper divisors (2581321913).

16645074391 is a wasteful number, since it uses less digits than its factorization.

16645074391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89011121.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 16645074391 in words is "sixteen billion, six hundred forty-five million, seventy-four thousand, three hundred ninety-one".