19879178953 has 4 divisors (see below), whose sum is σ = 19950945220. Its totient is φ = 19807412688.

The previous prime is 19879178951. The next prime is 19879178993. The reversal of 19879178953 is 35987197891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1394873104 + 18484305849 = 37348^2 + 135957^2 .

It is a cyclic number.

It is not a de Polignac number, because 19879178953 - 2¹ = 19879178951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19879178951) 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, 35882718 + ... + 35883271.

It is an arithmetic number, because the mean of its divisors is an integer number (4987736305).

Almost surely, 2^19879178953 is an apocalyptic number.

It is an amenable number.

19879178953 is a deficient number, since it is larger than the sum of its proper divisors (71766267).

19879178953 is an equidigital number, since it uses as much as digits as its factorization.

19879178953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71766266.

The product of its digits is 34292160, while the sum is 67.

The spelling of 19879178953 in words is "nineteen billion, eight hundred seventy-nine million, one hundred seventy-eight thousand, nine hundred fifty-three".