1445553665 has 8 divisors (see below), whose sum is σ = 1758427368. Its totient is φ = 1140600960.

The previous prime is 1445553643. The next prime is 1445553671. The reversal of 1445553665 is 5663555441.

It can be written as a sum of positive squares in 4 ways, for example, as 297631504 + 1147922161 = 17252^2 + 33881^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1445553665 - 2⁸ = 1445553409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1979846 + ... + 1980575.

It is an arithmetic number, because the mean of its divisors is an integer number (219803421).

Almost surely, 2^1445553665 is an apocalyptic number.

It is an amenable number.

1445553665 is a deficient number, since it is larger than the sum of its proper divisors (312873703).

1445553665 is an equidigital number, since it uses as much as digits as its factorization.

1445553665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960499.

The product of its digits is 1080000, while the sum is 44.

The square root of 1445553665 is about 38020.4374646058. The cubic root of 1445553665 is about 1130.6930942595.

The spelling of 1445553665 in words is "one billion, four hundred forty-five million, five hundred fifty-three thousand, six hundred sixty-five".