19795297787 has 4 divisors (see below), whose sum is σ = 19797229776. Its totient is φ = 19793365800.

The previous prime is 19795297751. The next prime is 19795297793. The reversal of 19795297787 is 78779259791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78779259791 = 5197 ⋅15158603.

It is a cyclic number.

It is not a de Polignac number, because 19795297787 - 2¹⁴ = 19795281403 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 19795297787.

It is not an unprimeable number, because it can be changed into a prime (19795297727) 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, 950543 + ... + 971144.

It is an arithmetic number, because the mean of its divisors is an integer number (4949307444).

Almost surely, 2^19795297787 is an apocalyptic number.

19795297787 is a deficient number, since it is larger than the sum of its proper divisors (1931989).

19795297787 is a wasteful number, since it uses less digits than its factorization.

19795297787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931988.

The product of its digits is 140026320, while the sum is 71.

The spelling of 19795297787 in words is "nineteen billion, seven hundred ninety-five million, two hundred ninety-seven thousand, seven hundred eighty-seven".