640186613829 has 32 divisors (see below), whose sum is σ = 1100091683840. Its totient is φ = 360360901296.

The previous prime is 640186613813. The next prime is 640186613837. The reversal of 640186613829 is 928316681046.

640186613829 is a `hidden beast` number, since 6 + 4 + 0 + 18 + 6 + 613 + 8 + 2 + 9 = 666.

It is not a de Polignac number, because 640186613829 - 2⁴ = 640186613813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640186613879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25265179 + ... + 25290504.

It is an arithmetic number, because the mean of its divisors is an integer number (34377865120).

Almost surely, 2^640186613829 is an apocalyptic number.

It is an amenable number.

640186613829 is a deficient number, since it is larger than the sum of its proper divisors (459905070011).

640186613829 is a wasteful number, since it uses less digits than its factorization.

640186613829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50555766 (or 50555760 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 640186613829 in words is "six hundred forty billion, one hundred eighty-six million, six hundred thirteen thousand, eight hundred twenty-nine".