1664850320538 has 16 divisors (see below), whose sum is σ = 3333371766240. Its totient is φ = 554338252656.

The previous prime is 1664850320527. The next prime is 1664850320543. The reversal of 1664850320538 is 8350230584661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152957653 + ... + 152968536.

It is an arithmetic number, because the mean of its divisors is an integer number (208335735390).

Almost surely, 2^{1664850320538} is an apocalyptic number.

1664850320538 is an abundant number, since it is smaller than the sum of its proper divisors (1668521445702).

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

1664850320538 is a wasteful number, since it uses less digits than its factorization.

1664850320538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305927101.

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 1664850320538 in words is "one trillion, six hundred sixty-four billion, eight hundred fifty million, three hundred twenty thousand, five hundred thirty-eight".