19945677679 has 4 divisors (see below), whose sum is σ = 19986634384. Its totient is φ = 19904720976.

The previous prime is 19945677659. The next prime is 19945677683. The reversal of 19945677679 is 97677654991.

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 19945677679 - 2⁷ = 19945677551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19945677649) 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, 20477622 + ... + 20478595.

It is an arithmetic number, because the mean of its divisors is an integer number (4996658596).

Almost surely, 2^19945677679 is an apocalyptic number.

19945677679 is a deficient number, since it is larger than the sum of its proper divisors (40956705).

19945677679 is an equidigital number, since it uses as much as digits as its factorization.

19945677679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40956704.

The product of its digits is 180033840, while the sum is 70.

The spelling of 19945677679 in words is "nineteen billion, nine hundred forty-five million, six hundred seventy-seven thousand, six hundred seventy-nine".