1664562564444 has 48 divisors (see below), whose sum is σ = 4196196426240. Its totient is φ = 510526223040.

The previous prime is 1664562564341. The next prime is 1664562564463. The reversal of 1664562564444 is 4444652654661.

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, 17106264 + ... + 17203295.

It is an arithmetic number, because the mean of its divisors is an integer number (87420758880).

Almost surely, 2^{1664562564444} is an apocalyptic number.

It is an amenable number.

1664562564444 is an abundant number, since it is smaller than the sum of its proper divisors (2531633861796).

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

1664562564444 is a wasteful number, since it uses less digits than its factorization.

1664562564444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34309890 (or 34309888 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 57.

The spelling of 1664562564444 in words is "one trillion, six hundred sixty-four billion, five hundred sixty-two million, five hundred sixty-four thousand, four hundred forty-four".