19838515664 has 40 divisors (see below), whose sum is σ = 41980542240. Its totient is φ = 9006940800.

The previous prime is 19838515649. The next prime is 19838515691. The reversal of 19838515664 is 46651583891.

It is a super-3 number, since 3×19838515664³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85574 + ... + 216794.

It is an arithmetic number, because the mean of its divisors is an integer number (1049513556).

Almost surely, 2^19838515664 is an apocalyptic number.

It is an amenable number.

19838515664 is an abundant number, since it is smaller than the sum of its proper divisors (22142026576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19838515664 is a wasteful number, since it uses less digits than its factorization.

19838515664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132099 (or 132093 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 56.

The spelling of 19838515664 in words is "nineteen billion, eight hundred thirty-eight million, five hundred fifteen thousand, six hundred sixty-four".