19797788179291 has 4 divisors (see below), whose sum is σ = 19797799700512. Its totient is φ = 19797776658072.

The previous prime is 19797788179259. The next prime is 19797788179313. The reversal of 19797788179291 is 19297188779791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 19797788179291 - 2⁵ = 19797788179259 is a prime.

It is a super-2 number, since 2×19797788179291² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19797788179199 and 19797788179208.

It is not an unprimeable number, because it can be changed into a prime (19797788479291) 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, 2607900 + ... + 6811513.

It is an arithmetic number, because the mean of its divisors is an integer number (4949449925128).

Almost surely, 2^{19797788179291} is an apocalyptic number.

19797788179291 is a deficient number, since it is larger than the sum of its proper divisors (11521221).

19797788179291 is an equidigital number, since it uses as much as digits as its factorization.

19797788179291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11521220.

The product of its digits is 2016379008, while the sum is 85.

The spelling of 19797788179291 in words is "nineteen trillion, seven hundred ninety-seven billion, seven hundred eighty-eight million, one hundred seventy-nine thousand, two hundred ninety-one".