19976915845 has 8 divisors (see below), whose sum is σ = 24003971064. Its totient is φ = 15960417984.

The previous prime is 19976915821. The next prime is 19976915851. The reversal of 19976915845 is 54851967991.

It can be written as a sum of positive squares in 4 ways, for example, as 1262949444 + 18713966401 = 35538^2 + 136799^2 .

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 19976915845 - 2⁹ = 19976915333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2635174 + ... + 2642743.

It is an arithmetic number, because the mean of its divisors is an integer number (3000496383).

Almost surely, 2^19976915845 is an apocalyptic number.

It is an amenable number.

19976915845 is a deficient number, since it is larger than the sum of its proper divisors (4027055219).

19976915845 is an equidigital number, since it uses as much as digits as its factorization.

19976915845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278679.

The product of its digits is 24494400, while the sum is 64.

The spelling of 19976915845 in words is "nineteen billion, nine hundred seventy-six million, nine hundred fifteen thousand, eight hundred forty-five".