638707468805 has 16 divisors (see below), whose sum is σ = 883693373184. Its totient is φ = 434094984960.

The previous prime is 638707468793. The next prime is 638707468859. The reversal of 638707468805 is 508864707836.

It is not a de Polignac number, because 638707468805 - 2⁸ = 638707468549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80742881 + ... + 80750790.

It is an arithmetic number, because the mean of its divisors is an integer number (55230835824).

Almost surely, 2^638707468805 is an apocalyptic number.

It is an amenable number.

638707468805 is a deficient number, since it is larger than the sum of its proper divisors (244985904379).

638707468805 is a wasteful number, since it uses less digits than its factorization.

638707468805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161493796.

The product of its (nonzero) digits is 54190080, while the sum is 62.

The spelling of 638707468805 in words is "six hundred thirty-eight billion, seven hundred seven million, four hundred sixty-eight thousand, eight hundred five".