640110312660 has 384 divisors, whose sum is σ = 2246221716480. Its totient is φ = 132605558784.

The previous prime is 640110312643. The next prime is 640110312701. The reversal of 640110312660 is 66213011046.

It is a super-4 number, since 4×640110312660⁴ (a number of 48 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 127 ways as a sum of consecutive naturals, for example, 91271314 + ... + 91278326.

It is an arithmetic number, because the mean of its divisors is an integer number (5849535720).

Almost surely, 2^640110312660 is an apocalyptic number.

640110312660 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 640110312660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123110858240).

640110312660 is an abundant number, since it is smaller than the sum of its proper divisors (1606111403820).

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

640110312660 is a wasteful number, since it uses less digits than its factorization.

640110312660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7347 (or 7345 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 640110312660 in words is "six hundred forty billion, one hundred ten million, three hundred twelve thousand, six hundred sixty".