1605994437120 has 320 divisors, whose sum is σ = 5293808745984. Its totient is φ = 415101173760.

The previous prime is 1605994437059. The next prime is 1605994437193. The reversal of 1605994437120 is 217344995061.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (320).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43242879 + ... + 43280001.

Almost surely, 2^{1605994437120} is an apocalyptic number.

1605994437120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1605994437120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2646904372992).

1605994437120 is an abundant number, since it is smaller than the sum of its proper divisors (3687814308864).

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

1605994437120 is a wasteful number, since it uses less digits than its factorization.

1605994437120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37323 (or 37307 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 1605994437120 in words is "one trillion, six hundred five billion, nine hundred ninety-four million, four hundred thirty-seven thousand, one hundred twenty".