1604531664420 has 96 divisors (see below), whose sum is σ = 4625127561600. Its totient is φ = 415317095424.

The previous prime is 1604531664403. The next prime is 1604531664433. The reversal of 1604531664420 is 244661354061.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67696 + ... + 1792664.

It is an arithmetic number, because the mean of its divisors is an integer number (48178412100).

Almost surely, 2^{1604531664420} is an apocalyptic number.

1604531664420 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 1604531664420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2312563780800).

1604531664420 is an abundant number, since it is smaller than the sum of its proper divisors (3020595897180).

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

1604531664420 is a wasteful number, since it uses less digits than its factorization.

1604531664420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725437 (or 1725435 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 1604531664420 in words is "one trillion, six hundred four billion, five hundred thirty-one million, six hundred sixty-four thousand, four hundred twenty".