16840347991 has 8 divisors (see below), whose sum is σ = 16991921664. Its totient is φ = 16689335520.

The previous prime is 16840347971. The next prime is 16840348003. The reversal of 16840347991 is 19974304861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16840347991 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 (16840347911) 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, 79900 + ... + 200161.

It is an arithmetic number, because the mean of its divisors is an integer number (2123990208).

Almost surely, 2^16840347991 is an apocalyptic number.

16840347991 is a deficient number, since it is larger than the sum of its proper divisors (151573673).

16840347991 is a wasteful number, since it uses less digits than its factorization.

16840347991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280601.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 16840347991 in words is "sixteen billion, eight hundred forty million, three hundred forty-seven thousand, nine hundred ninety-one".