19783629505 has 4 divisors (see below), whose sum is σ = 23740355412. Its totient is φ = 15826903600.

The previous prime is 19783629497. The next prime is 19783629511. The reversal of 19783629505 is 50592638791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50592638791 = 20753 ⋅2437847.

It can be written as a sum of positive squares in 2 ways, for example, as 4360225024 + 15423404481 = 66032^2 + 124191^2 .

It is not a de Polignac number, because 19783629505 - 2³ = 19783629497 is a prime.

It is a super-2 number, since 2×19783629505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978362946 + ... + 1978362955.

It is an arithmetic number, because the mean of its divisors is an integer number (5935088853).

Almost surely, 2^19783629505 is an apocalyptic number.

It is an amenable number.

19783629505 is a deficient number, since it is larger than the sum of its proper divisors (3956725907).

19783629505 is an equidigital number, since it uses as much as digits as its factorization.

19783629505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956725906.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 19783629505 in words is "nineteen billion, seven hundred eighty-three million, six hundred twenty-nine thousand, five hundred five".