1639890945018 has 48 divisors (see below), whose sum is σ = 3617724442176. Its totient is φ = 536740110720.

The previous prime is 1639890944977. The next prime is 1639890945019. The reversal of 1639890945018 is 8105490989361.

1639890945018 is a `hidden beast` number, since 1 + 6 + 3 + 98 + 90 + 9 + 450 + 1 + 8 = 666.

It is a super-3 number, since 3×1639890945018³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1639890945019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1811071 + ... + 2561202.

It is an arithmetic number, because the mean of its divisors is an integer number (75369259212).

Almost surely, 2^{1639890945018} is an apocalyptic number.

1639890945018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1639890945018 is an abundant number, since it is smaller than the sum of its proper divisors (1977833497158).

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

1639890945018 is a wasteful number, since it uses less digits than its factorization.

1639890945018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372659 (or 4372656 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 63.

The spelling of 1639890945018 in words is "one trillion, six hundred thirty-nine billion, eight hundred ninety million, nine hundred forty-five thousand, eighteen".