1445553664 has 40 divisors (see below), whose sum is σ = 2920828680. Its totient is φ = 714633216.

The previous prime is 1445553643. The next prime is 1445553671. The reversal of 1445553664 is 4663555441.

It is a self number, because there is not a number n which added to its sum of digits gives 1445553664.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29707 + ... + 61429.

It is an arithmetic number, because the mean of its divisors is an integer number (73020717).

Almost surely, 2^1445553664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1445553664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1460414340).

1445553664 is an abundant number, since it is smaller than the sum of its proper divisors (1475275016).

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

1445553664 is an frugal number, since it uses more digits than its factorization.

1445553664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31830 (or 31814 counting only the distinct ones).

The product of its digits is 864000, while the sum is 43.

The square root of 1445553664 is about 38020.4374514550. The cubic root of 1445553664 is about 1130.6930939988.

The spelling of 1445553664 in words is "one billion, four hundred forty-five million, five hundred fifty-three thousand, six hundred sixty-four".