639452084585 has 16 divisors (see below), whose sum is σ = 815043359376. Its totient is φ = 479950952448.

The previous prime is 639452084561. The next prime is 639452084597. The reversal of 639452084585 is 585480254936.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 131476584409 + 507975500176 = 362597^2 + 712724^2 .

It is a cyclic number.

It is not a de Polignac number, because 639452084585 - 2¹⁸ = 639451822441 is a prime.

It is a super-3 number, since 3×639452084585³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11838932 + ... + 11892821.

It is an arithmetic number, because the mean of its divisors is an integer number (50940209961).

Almost surely, 2^639452084585 is an apocalyptic number.

It is an amenable number.

639452084585 is a deficient number, since it is larger than the sum of its proper divisors (175591274791).

639452084585 is a wasteful number, since it uses less digits than its factorization.

639452084585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23732092.

The product of its (nonzero) digits is 41472000, while the sum is 59.

The spelling of 639452084585 in words is "six hundred thirty-nine billion, four hundred fifty-two million, eighty-four thousand, five hundred eighty-five".