19181006781713 has 4 divisors (see below), whose sum is σ = 21921150607680. Its totient is φ = 16440862955748.

The previous prime is 19181006781701. The next prime is 19181006781749. The reversal of 19181006781713 is 31718760018191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 19181006781713 - 2²⁰ = 19181005733137 is a prime.

It is a super-2 number, since 2×19181006781713² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19181006781113) 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, 1370071912973 + ... + 1370071912986.

It is an arithmetic number, because the mean of its divisors is an integer number (5480287651920).

Almost surely, 2^{19181006781713} is an apocalyptic number.

It is an amenable number.

19181006781713 is a deficient number, since it is larger than the sum of its proper divisors (2740143825967).

19181006781713 is an equidigital number, since it uses as much as digits as its factorization.

19181006781713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740143825966.

The product of its (nonzero) digits is 508032, while the sum is 53.

The spelling of 19181006781713 in words is "nineteen trillion, one hundred eighty-one billion, six million, seven hundred eighty-one thousand, seven hundred thirteen".