648144781445 has 16 divisors (see below), whose sum is σ = 890937143040. Its totient is φ = 443415700224.

The previous prime is 648144781439. The next prime is 648144781457. The reversal of 648144781445 is 544187441846.

It is a happy number.

It is not a de Polignac number, because 648144781445 - 2¹⁴ = 648144765061 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21368705 + ... + 21399014.

It is an arithmetic number, because the mean of its divisors is an integer number (55683571440).

Almost surely, 2^648144781445 is an apocalyptic number.

It is an amenable number.

648144781445 is a deficient number, since it is larger than the sum of its proper divisors (242792361595).

648144781445 is a wasteful number, since it uses less digits than its factorization.

648144781445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42768164.

The product of its digits is 13762560, while the sum is 56.

The spelling of 648144781445 in words is "six hundred forty-eight billion, one hundred forty-four million, seven hundred eighty-one thousand, four hundred forty-five".