19528968605 has 4 divisors (see below), whose sum is σ = 23434762332. Its totient is φ = 15623174880.

The previous prime is 19528968601. The next prime is 19528968617. The reversal of 19528968605 is 50686982591.

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 8601820516 + 10927148089 = 92746^2 + 104533^2 .

It is not a de Polignac number, because 19528968605 - 2² = 19528968601 is a prime.

It is a super-2 number, since 2×19528968605² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19528968601) 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, 1952896856 + ... + 1952896865.

It is an arithmetic number, because the mean of its divisors is an integer number (5858690583).

Almost surely, 2^19528968605 is an apocalyptic number.

It is an amenable number.

19528968605 is a deficient number, since it is larger than the sum of its proper divisors (3905793727).

19528968605 is an equidigital number, since it uses as much as digits as its factorization.

19528968605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905793726.

The product of its (nonzero) digits is 9331200, while the sum is 59.

The spelling of 19528968605 in words is "nineteen billion, five hundred twenty-eight million, nine hundred sixty-eight thousand, six hundred five".