648825384421 has 2 divisors, whose sum is σ = 648825384422. Its totient is φ = 648825384420.

The previous prime is 648825384401. The next prime is 648825384439. The reversal of 648825384421 is 124483528846.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543037821921 + 105787562500 = 736911^2 + 325250^2 .

It is a cyclic number.

It is not a de Polignac number, because 648825384421 - 2³⁷ = 511386430949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648825384401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324412692210 + 324412692211.

It is an arithmetic number, because the mean of its divisors is an integer number (324412692211).

Almost surely, 2^648825384421 is an apocalyptic number.

It is an amenable number.

648825384421 is a deficient number, since it is larger than the sum of its proper divisors (1).

648825384421 is an equidigital number, since it uses as much as digits as its factorization.

648825384421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11796480, while the sum is 55.

The spelling of 648825384421 in words is "six hundred forty-eight billion, eight hundred twenty-five million, three hundred eighty-four thousand, four hundred twenty-one".