1445661646 has 32 divisors (see below), whose sum is σ = 2549903328. Its totient is φ = 606023040.

The previous prime is 1445661617. The next prime is 1445661649. The reversal of 1445661646 is 6461665441.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445661649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535476 + ... + 538168.

It is an arithmetic number, because the mean of its divisors is an integer number (79684479).

Almost surely, 2^1445661646 is an apocalyptic number.

1445661646 is a deficient number, since it is larger than the sum of its proper divisors (1104241682).

1445661646 is a wasteful number, since it uses less digits than its factorization.

1445661646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4596.

The product of its digits is 414720, while the sum is 43.

The square root of 1445661646 is about 38021.8574769829. The cubic root of 1445661646 is about 1130.7212473320.

The spelling of 1445661646 in words is "one billion, four hundred forty-five million, six hundred sixty-one thousand, six hundred forty-six".