1621670552304 has 80 divisors (see below), whose sum is σ = 4571354331264. Its totient is φ = 491287161600.

The previous prime is 1621670552297. The next prime is 1621670552353. The reversal of 1621670552304 is 4032550761261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1635819 + ... + 2432949.

Almost surely, 2^{1621670552304} is an apocalyptic number.

It is an amenable number.

1621670552304 is an abundant number, since it is smaller than the sum of its proper divisors (2949683778960).

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

1621670552304 is a wasteful number, since it uses less digits than its factorization.

1621670552304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801006 (or 801000 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 1621670552304 in words is "one trillion, six hundred twenty-one billion, six hundred seventy million, five hundred fifty-two thousand, three hundred four".