16740621991 has 8 divisors (see below), whose sum is σ = 17203831200. Its totient is φ = 16277979168.

The previous prime is 16740621959. The next prime is 16740622001. The reversal of 16740621991 is 19912604761.

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 16740621991 - 2⁵ = 16740621959 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 (16740621941) 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, 81316 + ... + 200233.

It is an arithmetic number, because the mean of its divisors is an integer number (2150478900).

Almost surely, 2^16740621991 is an apocalyptic number.

16740621991 is a deficient number, since it is larger than the sum of its proper divisors (463209209).

16740621991 is a wasteful number, since it uses less digits than its factorization.

16740621991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283193.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 16740621991 in words is "sixteen billion, seven hundred forty million, six hundred twenty-one thousand, nine hundred ninety-one".