1997609418904 has 64 divisors (see below), whose sum is σ = 4164098342400. Its totient is φ = 890799811200.

The previous prime is 1997609418901. The next prime is 1997609418949. The reversal of 1997609418904 is 4098149067991.

It is a super-2 number, since 2×1997609418904² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1997609418904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997609418901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176359 + ... + 2006569.

It is an arithmetic number, because the mean of its divisors is an integer number (65064036600).

Almost surely, 2^{1997609418904} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997609418904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2082049171200).

1997609418904 is an abundant number, since it is smaller than the sum of its proper divisors (2166488923496).

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

1997609418904 is a wasteful number, since it uses less digits than its factorization.

1997609418904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830464 (or 1830460 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 67.

The spelling of 1997609418904 in words is "one trillion, nine hundred ninety-seven billion, six hundred nine million, four hundred eighteen thousand, nine hundred four".