19065881797 has 12 divisors (see below), whose sum is σ = 20155873836. Its totient is φ = 18032155200.

The previous prime is 19065881767. The next prime is 19065881833. The reversal of 19065881797 is 79718856091.

It can be written as a sum of positive squares in 2 ways, for example, as 15753764196 + 3312117601 = 125514^2 + 57551^2 .

It is not a de Polignac number, because 19065881797 - 2⁷ = 19065881669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19065881767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173023 + ... + 260899.

It is an arithmetic number, because the mean of its divisors is an integer number (1679656153).

Almost surely, 2^19065881797 is an apocalyptic number.

It is an amenable number.

19065881797 is a deficient number, since it is larger than the sum of its proper divisors (1089992039).

19065881797 is an equidigital number, since it uses as much as digits as its factorization.

19065881797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88516 (or 88497 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 61.

The spelling of 19065881797 in words is "nineteen billion, sixty-five million, eight hundred eighty-one thousand, seven hundred ninety-seven".