1638090009020 has 48 divisors (see below), whose sum is σ = 3713331504960. Its totient is φ = 605135494656.

The previous prime is 1638090009013. The next prime is 1638090009091. The reversal of 1638090009020 is 209000908361.

It is a super-2 number, since 2×1638090009020² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61384337 + ... + 61411016.

It is an arithmetic number, because the mean of its divisors is an integer number (77361073020).

Almost surely, 2^{1638090009020} is an apocalyptic number.

1638090009020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1638090009020 is an abundant number, since it is smaller than the sum of its proper divisors (2075241495940).

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

1638090009020 is a wasteful number, since it uses less digits than its factorization.

1638090009020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122795414 (or 122795412 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 1638090009020 in words is "one trillion, six hundred thirty-eight billion, ninety million, nine thousand, twenty".