19850638517 has 8 divisors (see below), whose sum is σ = 20344642176. Its totient is φ = 19359620352.

The previous prime is 19850638513. The next prime is 19850638547. The reversal of 19850638517 is 71583605891.

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

It is not a de Polignac number, because 19850638517 - 2² = 19850638513 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 (19850638513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732908 + ... + 759509.

It is an arithmetic number, because the mean of its divisors is an integer number (2543080272).

Almost surely, 2^19850638517 is an apocalyptic number.

It is an amenable number.

19850638517 is a deficient number, since it is larger than the sum of its proper divisors (494003659).

19850638517 is a wasteful number, since it uses less digits than its factorization.

19850638517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492747.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 19850638517 in words is "nineteen billion, eight hundred fifty million, six hundred thirty-eight thousand, five hundred seventeen".