16640297819 has 4 divisors (see below), whose sum is σ = 16656596880. Its totient is φ = 16623998760.

The previous prime is 16640297797. The next prime is 16640297827. The reversal of 16640297819 is 91879204661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91879204661 = 15809 ⋅5811829.

It is a cyclic number.

It is not a de Polignac number, because 16640297819 - 2⁸ = 16640297563 is a prime.

It is a super-2 number, since 2×16640297819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16640297419) 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, 8147999 + ... + 8150040.

It is an arithmetic number, because the mean of its divisors is an integer number (4164149220).

Almost surely, 2^16640297819 is an apocalyptic number.

16640297819 is a deficient number, since it is larger than the sum of its proper divisors (16299061).

16640297819 is a wasteful number, since it uses less digits than its factorization.

16640297819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16299060.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 16640297819 in words is "sixteen billion, six hundred forty million, two hundred ninety-seven thousand, eight hundred nineteen".