16639771840319 has 4 divisors (see below), whose sum is σ = 16640027795544. Its totient is φ = 16639515885096.

The previous prime is 16639771840273. The next prime is 16639771840331. The reversal of 16639771840319 is 91304817793661.

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-16639771840319 is a prime.

It is a super-2 number, since 2×16639771840319² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16639771840519) 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, 127880072 + ... + 128010125.

It is an arithmetic number, because the mean of its divisors is an integer number (4160006948886).

Almost surely, 2^{16639771840319} is an apocalyptic number.

16639771840319 is a deficient number, since it is larger than the sum of its proper divisors (255955225).

16639771840319 is an equidigital number, since it uses as much as digits as its factorization.

16639771840319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255955224.

The product of its (nonzero) digits is 41150592, while the sum is 65.

The spelling of 16639771840319 in words is "sixteen trillion, six hundred thirty-nine billion, seven hundred seventy-one million, eight hundred forty thousand, three hundred nineteen".