16720078579 has 4 divisors (see below), whose sum is σ = 16779580920. Its totient is φ = 16660576240.

The previous prime is 16720078549. The next prime is 16720078607. The reversal of 16720078579 is 97587002761.

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

It is a cyclic number.

It is not a de Polignac number, because 16720078579 - 2¹⁷ = 16719947507 is a prime.

It is a super-2 number, since 2×16720078579² (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 (16720078519) 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, 29750749 + ... + 29751310.

It is an arithmetic number, because the mean of its divisors is an integer number (4194895230).

Almost surely, 2^16720078579 is an apocalyptic number.

16720078579 is a deficient number, since it is larger than the sum of its proper divisors (59502341).

16720078579 is an equidigital number, since it uses as much as digits as its factorization.

16720078579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59502340.

The product of its (nonzero) digits is 1481760, while the sum is 52.

The spelling of 16720078579 in words is "sixteen billion, seven hundred twenty million, seventy-eight thousand, five hundred seventy-nine".