638827807073 has 8 divisors (see below), whose sum is σ = 639182917800. Its totient is φ = 638472802048.

The previous prime is 638827807069. The next prime is 638827807099. The reversal of 638827807073 is 370708728836.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 199726760464 + 439101046609 = 446908^2 + 662647^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638827807073 - 2² = 638827807069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638827707073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14070473 + ... + 14115801.

It is an arithmetic number, because the mean of its divisors is an integer number (79897864725).

Almost surely, 2^638827807073 is an apocalyptic number.

It is an amenable number.

638827807073 is a deficient number, since it is larger than the sum of its proper divisors (355110727).

638827807073 is a wasteful number, since it uses less digits than its factorization.

638827807073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52851.

The product of its (nonzero) digits is 18966528, while the sum is 59.

The spelling of 638827807073 in words is "six hundred thirty-eight billion, eight hundred twenty-seven million, eight hundred seven thousand, seventy-three".