16749293971 has 4 divisors (see below), whose sum is σ = 16790246200. Its totient is φ = 16708341744.

The previous prime is 16749293947. The next prime is 16749293983. The reversal of 16749293971 is 17939294761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17939294761 = 17 ⋅1055252633.

It is a cyclic number.

It is not a de Polignac number, because 16749293971 - 2²⁵ = 16715739539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16749293371) 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, 20475501 + ... + 20476318.

It is an arithmetic number, because the mean of its divisors is an integer number (4197561550).

Almost surely, 2^16749293971 is an apocalyptic number.

16749293971 is a deficient number, since it is larger than the sum of its proper divisors (40952229).

16749293971 is an equidigital number, since it uses as much as digits as its factorization.

16749293971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40952228.

The product of its digits is 5143824, while the sum is 58.

The spelling of 16749293971 in words is "sixteen billion, seven hundred forty-nine million, two hundred ninety-three thousand, nine hundred seventy-one".