1445664440661 has 32 divisors (see below), whose sum is σ = 2223895938048. Its totient is φ = 818229671040.

The previous prime is 1445664440659. The next prime is 1445664440683. The reversal of 1445664440661 is 1660444665441.

It is not a de Polignac number, because 1445664440661 - 2¹ = 1445664440659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445664440621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13453201 + ... + 13560233.

It is an arithmetic number, because the mean of its divisors is an integer number (69496748064).

Almost surely, 2^{1445664440661} is an apocalyptic number.

It is an amenable number.

1445664440661 is a deficient number, since it is larger than the sum of its proper divisors (778231497387).

1445664440661 is a wasteful number, since it uses less digits than its factorization.

1445664440661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113161.

The product of its (nonzero) digits is 6635520, while the sum is 51.

The spelling of 1445664440661 in words is "one trillion, four hundred forty-five billion, six hundred sixty-four million, four hundred forty thousand, six hundred sixty-one".