144640646545 has 8 divisors (see below), whose sum is σ = 173573677224. Its totient is φ = 115709249664.

The previous prime is 144640646539. The next prime is 144640646567. The reversal of 144640646545 is 545646046441.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2924538241 + 141716108304 = 54079^2 + 376452^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 144640646545 - 2³ = 144640646537 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, 204414 + ... + 575383.

It is an arithmetic number, because the mean of its divisors is an integer number (21696709653).

Almost surely, 2^144640646545 is an apocalyptic number.

It is an amenable number.

144640646545 is a deficient number, since it is larger than the sum of its proper divisors (28933030679).

144640646545 is an equidigital number, since it uses as much as digits as its factorization.

144640646545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816899.

The product of its (nonzero) digits is 5529600, while the sum is 49.

The spelling of 144640646545 in words is "one hundred forty-four billion, six hundred forty million, six hundred forty-six thousand, five hundred forty-five".