1604981640621 has 8 divisors (see below), whose sum is σ = 2167063818880. Its totient is φ = 1056443611392.

The previous prime is 1604981640611. The next prime is 1604981640643. The reversal of 1604981640621 is 1260461894061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1604981640621 - 2³⁰ = 1603907898797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604981640611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3386036980 + ... + 3386037453.

It is an arithmetic number, because the mean of its divisors is an integer number (270882977360).

Almost surely, 2^{1604981640621} is an apocalyptic number.

It is an amenable number.

1604981640621 is a deficient number, since it is larger than the sum of its proper divisors (562082178259).

1604981640621 is an equidigital number, since it uses as much as digits as its factorization.

1604981640621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6772074515.

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 1604981640621 in words is "one trillion, six hundred four billion, nine hundred eighty-one million, six hundred forty thousand, six hundred twenty-one".