19806078485 has 8 divisors (see below), whose sum is σ = 24346984536. Its totient is φ = 15458402560.

The previous prime is 19806078473. The next prime is 19806078499. The reversal of 19806078485 is 58487060891.

It can be written as a sum of positive squares in 4 ways, for example, as 3362376196 + 16443702289 = 57986^2 + 128233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19806078485 - 2¹² = 19806074389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19806078485.

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, 48307304 + ... + 48307713.

It is an arithmetic number, because the mean of its divisors is an integer number (3043373067).

Almost surely, 2^19806078485 is an apocalyptic number.

It is an amenable number.

19806078485 is a deficient number, since it is larger than the sum of its proper divisors (4540906051).

19806078485 is an equidigital number, since it uses as much as digits as its factorization.

19806078485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96615063.

The product of its (nonzero) digits is 3870720, while the sum is 56.

The spelling of 19806078485 in words is "nineteen billion, eight hundred six million, seventy-eight thousand, four hundred eighty-five".