640170145487 has 16 divisors (see below), whose sum is σ = 673156332000. Its totient is φ = 607983366144.

The previous prime is 640170145481. The next prime is 640170145519. The reversal of 640170145487 is 784541071046.

It is a cyclic number.

It is not a de Polignac number, because 640170145487 - 2²⁴ = 640153368271 is a prime.

It is a super-3 number, since 3×640170145487³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640170145481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144437 + ... + 1140702.

It is an arithmetic number, because the mean of its divisors is an integer number (42072270750).

Almost surely, 2^640170145487 is an apocalyptic number.

640170145487 is a deficient number, since it is larger than the sum of its proper divisors (32986186513).

640170145487 is a wasteful number, since it uses less digits than its factorization.

640170145487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285450.

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 640170145487 in words is "six hundred forty billion, one hundred seventy million, one hundred forty-five thousand, four hundred eighty-seven".