640477366122 has 64 divisors (see below), whose sum is σ = 1447189286400. Its totient is φ = 187184383680.

The previous prime is 640477366079. The next prime is 640477366163. The reversal of 640477366122 is 221663774046.

It is a super-3 number, since 3×640477366122³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1551529 + ... + 1920467.

It is an arithmetic number, because the mean of its divisors is an integer number (22612332600).

Almost surely, 2^640477366122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640477366122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723594643200).

640477366122 is an abundant number, since it is smaller than the sum of its proper divisors (806711920278).

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

640477366122 is a wasteful number, since it uses less digits than its factorization.

640477366122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369891.

The product of its (nonzero) digits is 2032128, while the sum is 48.

The spelling of 640477366122 in words is "six hundred forty billion, four hundred seventy-seven million, three hundred sixty-six thousand, one hundred twenty-two".