1621603590084 has 81 divisors (see below), whose sum is σ = 4117308421863. Its totient is φ = 538137949824.

The previous prime is 1621603590067. The next prime is 1621603590179. The reversal of 1621603590084 is 4800953061261.

The square root of 1621603590084 is 1273422.

It is a perfect power (a square), and thus also a powerful number.

1621603590084 is a `hidden beast` number, since 1 + 6 + 216 + 0 + 359 + 0 + 0 + 84 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 164097908100 + 1457505681984 = 405090^2 + 1207272^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2849918152 + ... + 2849918720.

Almost surely, 2^{1621603590084} is an apocalyptic number.

1621603590084 is the 1273422-nd square number.

It is an amenable number.

1621603590084 is an abundant number, since it is smaller than the sum of its proper divisors (2495704831779).

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

1621603590084 is an frugal number, since it uses more digits than its factorization.

1621603590084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894 (or 947 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 1621603590084 in words is "one trillion, six hundred twenty-one billion, six hundred three million, five hundred ninety thousand, eighty-four".