648635442242 has 18 divisors (see below), whose sum is σ = 977948506899. Its totient is φ = 322661077620.

The previous prime is 648635442229. The next prime is 648635442311. The reversal of 648635442242 is 242244536846.

It can be written as a sum of positive squares in only one way, i.e., 324317721121 + 324317721121 = 569489^2 + 569489^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=569489.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 240323009 + ... + 240325707.

Almost surely, 2^648635442242 is an apocalyptic number.

648635442242 is a deficient number, since it is larger than the sum of its proper divisors (329313064657).

648635442242 is an frugal number, since it uses more digits than its factorization.

648635442242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5822 (or 2912 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 50.

Multiplying 648635442242 by its sum of digits (50), we get a square (32431772112100 = 5694890²).

The spelling of 648635442242 in words is "six hundred forty-eight billion, six hundred thirty-five million, four hundred forty-two thousand, two hundred forty-two".