1445538661 has 24 divisors (see below), whose sum is σ = 1761502464. Its totient is φ = 1180539360.

The previous prime is 1445538659. The next prime is 1445538667. The reversal of 1445538661 is 1668355441.

It is not a de Polignac number, because 1445538661 - 2¹ = 1445538659 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 (1445538667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 303051 + ... + 307783.

It is an arithmetic number, because the mean of its divisors is an integer number (73395936).

Almost surely, 2^1445538661 is an apocalyptic number.

It is an amenable number.

1445538661 is a deficient number, since it is larger than the sum of its proper divisors (315963803).

1445538661 is a wasteful number, since it uses less digits than its factorization.

1445538661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041 (or 5034 counting only the distinct ones).

The product of its digits is 345600, while the sum is 43.

The square root of 1445538661 is about 38020.2401491627. The cubic root of 1445538661 is about 1130.6891822688.

The spelling of 1445538661 in words is "one billion, four hundred forty-five million, five hundred thirty-eight thousand, six hundred sixty-one".