16378812109 has 8 divisors (see below), whose sum is σ = 17924164128. Its totient is φ = 14842854960.

The previous prime is 16378812083. The next prime is 16378812119. The reversal of 16378812109 is 90121887361.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16378812109 - 2⁹ = 16378811597 is a prime.

It is a super-2 number, since 2×16378812109² (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 (16378812119) 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, 2345067 + ... + 2352040.

It is an arithmetic number, because the mean of its divisors is an integer number (2240520516).

Almost surely, 2^16378812109 is an apocalyptic number.

It is an amenable number.

16378812109 is a deficient number, since it is larger than the sum of its proper divisors (1545352019).

16378812109 is a wasteful number, since it uses less digits than its factorization.

16378812109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4697435.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 16378812109 in words is "sixteen billion, three hundred seventy-eight million, eight hundred twelve thousand, one hundred nine".