640046440425089 has 2 divisors, whose sum is σ = 640046440425090. Its totient is φ = 640046440425088.

The previous prime is 640046440425083. The next prime is 640046440425173. The reversal of 640046440425089 is 980524044640046.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386618507288689 + 253427933136400 = 19662617^2 + 15919420^2 .

It is a cyclic number.

It is not a de Polignac number, because 640046440425089 - 2⁴⁰ = 638946928797313 is a prime.

It is not a weakly prime, because it can be changed into another prime (640046440425083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320023220212544 + 320023220212545.

It is an arithmetic number, because the mean of its divisors is an integer number (320023220212545).

Almost surely, 2^{640046440425089} is an apocalyptic number.

It is an amenable number.

640046440425089 is a deficient number, since it is larger than the sum of its proper divisors (1).

640046440425089 is an equidigital number, since it uses as much as digits as its factorization.

640046440425089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26542080, while the sum is 56.

The spelling of 640046440425089 in words is "six hundred forty trillion, forty-six billion, four hundred forty million, four hundred twenty-five thousand, eighty-nine".