1638496495428 has 24 divisors (see below), whose sum is σ = 4117247604288. Its totient is φ = 504152767776.

The previous prime is 1638496495411. The next prime is 1638496495451. The reversal of 1638496495428 is 8245946948361.

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, 5251591176 + ... + 5251591487.

It is an arithmetic number, because the mean of its divisors is an integer number (171551983512).

Almost surely, 2^{1638496495428} is an apocalyptic number.

It is an amenable number.

1638496495428 is an abundant number, since it is smaller than the sum of its proper divisors (2478751108860).

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

1638496495428 is a wasteful number, since it uses less digits than its factorization.

1638496495428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10503182683 (or 10503182681 counting only the distinct ones).

The product of its digits is 358318080, while the sum is 69.

The spelling of 1638496495428 in words is "one trillion, six hundred thirty-eight billion, four hundred ninety-six million, four hundred ninety-five thousand, four hundred twenty-eight".