1638099081936 has 100 divisors (see below), whose sum is σ = 4778466237952. Its totient is φ = 541733500224.

The previous prime is 1638099081919. The next prime is 1638099081937. The reversal of 1638099081936 is 6391809908361.

1638099081936 is a `hidden beast` number, since 1 + 6 + 380 + 9 + 90 + 81 + 93 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638099081937) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4811650 + ... + 5140833.

Almost surely, 2^{1638099081936} is an apocalyptic number.

1638099081936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1638099081936 is an abundant number, since it is smaller than the sum of its proper divisors (3140367156016).

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

1638099081936 is a wasteful number, since it uses less digits than its factorization.

1638099081936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9952630 (or 9952615 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 1638099081936 in words is "one trillion, six hundred thirty-eight billion, ninety-nine million, eighty-one thousand, nine hundred thirty-six".