19946464579 has 4 divisors (see below), whose sum is σ = 19977294384. Its totient is φ = 19915634776.

The previous prime is 19946464553. The next prime is 19946464583. The reversal of 19946464579 is 97546464991.

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 19946464579 - 2¹⁹ = 19945940291 is a prime.

It is a super-2 number, since 2×19946464579² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19946464579.

It is not an unprimeable number, because it can be changed into a prime (19946464519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15413932 + ... + 15415225.

It is an arithmetic number, because the mean of its divisors is an integer number (4994323596).

Almost surely, 2^19946464579 is an apocalyptic number.

19946464579 is a deficient number, since it is larger than the sum of its proper divisors (30829805).

19946464579 is an equidigital number, since it uses as much as digits as its factorization.

19946464579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30829804.

The product of its digits is 58786560, while the sum is 64.

The spelling of 19946464579 in words is "nineteen billion, nine hundred forty-six million, four hundred sixty-four thousand, five hundred seventy-nine".