16649087439 has 4 divisors (see below), whose sum is σ = 22198783256. Its totient is φ = 11099391624.

The previous prime is 16649087417. The next prime is 16649087449. The reversal of 16649087439 is 93478094661.

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

It is not a de Polignac number, because 16649087439 - 2¹² = 16649083343 is a prime.

It is a super-2 number, since 2×16649087439² (a number of 21 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 (16649087449) 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, 2774847904 + ... + 2774847909.

It is an arithmetic number, because the mean of its divisors is an integer number (5549695814).

Almost surely, 2^16649087439 is an apocalyptic number.

16649087439 is a deficient number, since it is larger than the sum of its proper divisors (5549695817).

16649087439 is an equidigital number, since it uses as much as digits as its factorization.

16649087439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5549695816.

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 16649087439 in words is "sixteen billion, six hundred forty-nine million, eighty-seven thousand, four hundred thirty-nine".