1604981375840 has 48 divisors (see below), whose sum is σ = 3791845431360. Its totient is φ = 641979525120.

The previous prime is 1604981375821. The next prime is 1604981375887. The reversal of 1604981375840 is 485731894061.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13341881 + ... + 13461639.

It is an arithmetic number, because the mean of its divisors is an integer number (78996779820).

Almost surely, 2^{1604981375840} is an apocalyptic number.

1604981375840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1604981375840 is an abundant number, since it is smaller than the sum of its proper divisors (2186864055520).

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

1604981375840 is a wasteful number, since it uses less digits than its factorization.

1604981375840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203535 (or 203527 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 1604981375840 in words is "one trillion, six hundred four billion, nine hundred eighty-one million, three hundred seventy-five thousand, eight hundred forty".