640209617160 has 128 divisors (see below), whose sum is σ = 1944330480000. Its totient is φ = 168628576256.

The previous prime is 640209617147. The next prime is 640209617189. The reversal of 640209617160 is 61716902046.

It is a Cunningham number, because it is equal to 800131²-1.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3100504 + ... + 3300536.

It is an arithmetic number, because the mean of its divisors is an integer number (15190081875).

Almost surely, 2^640209617160 is an apocalyptic number.

640209617160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640209617160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972165240000).

640209617160 is an abundant number, since it is smaller than the sum of its proper divisors (1304120862840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640209617160 is a wasteful number, since it uses less digits than its factorization.

640209617160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200375 (or 200371 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 640209617160 in words is "six hundred forty billion, two hundred nine million, six hundred seventeen thousand, one hundred sixty".