1628558855989 has 8 divisors (see below), whose sum is σ = 1753843082040. Its totient is φ = 1503276125376.

The previous prime is 1628558855947. The next prime is 1628558856007. The reversal of 1628558855989 is 9895588558261.

It can be written as a sum of positive squares in 4 ways, for example, as 33489 + 1628558822500 = 183^2 + 1276150^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1628558855989 - 2¹¹ = 1628558853941 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 (1628558855489) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3047979 + ... + 3542215.

It is an arithmetic number, because the mean of its divisors is an integer number (219230385255).

Almost surely, 2^{1628558855989} is an apocalyptic number.

It is an amenable number.

1628558855989 is a deficient number, since it is larger than the sum of its proper divisors (125284226051).

1628558855989 is a wasteful number, since it uses less digits than its factorization.

1628558855989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747719.

The product of its digits is 2488320000, while the sum is 79.

The spelling of 1628558855989 in words is "one trillion, six hundred twenty-eight billion, five hundred fifty-eight million, eight hundred fifty-five thousand, nine hundred eighty-nine".