16380991271 has 4 divisors (see below), whose sum is σ = 16690066632. Its totient is φ = 16071915912.

The previous prime is 16380991229. The next prime is 16380991273. The reversal of 16380991271 is 17219908361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16380991271 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 (16380991273) 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, 154537601 + ... + 154537706.

It is an arithmetic number, because the mean of its divisors is an integer number (4172516658).

Almost surely, 2^16380991271 is an apocalyptic number.

16380991271 is a deficient number, since it is larger than the sum of its proper divisors (309075361).

16380991271 is an equidigital number, since it uses as much as digits as its factorization.

16380991271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309075360.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 16380991271 in words is "sixteen billion, three hundred eighty million, nine hundred ninety-one thousand, two hundred seventy-one".