638654006433 has 8 divisors (see below), whose sum is σ = 879007664896. Its totient is φ = 412034842800.

The previous prime is 638654006399. The next prime is 638654006489. The reversal of 638654006433 is 334600456836.

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

It is not a de Polignac number, because 638654006433 - 2²⁹ = 638117135521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638654006033) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3433623598 + ... + 3433623783.

It is an arithmetic number, because the mean of its divisors is an integer number (109875958112).

Almost surely, 2^638654006433 is an apocalyptic number.

It is an amenable number.

638654006433 is a deficient number, since it is larger than the sum of its proper divisors (240353658463).

638654006433 is a wasteful number, since it uses less digits than its factorization.

638654006433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6867247415.

The product of its (nonzero) digits is 3732480, while the sum is 48.

The spelling of 638654006433 in words is "six hundred thirty-eight billion, six hundred fifty-four million, six thousand, four hundred thirty-three".