646244561140 has 48 divisors (see below), whose sum is σ = 1401493124304. Its totient is φ = 250121779200.

The previous prime is 646244561129. The next prime is 646244561153. The reversal of 646244561140 is 41165442646.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 135997213284 + 510247347856 = 368778^2 + 714316^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2278501 + ... + 2546380.

It is an arithmetic number, because the mean of its divisors is an integer number (29197773423).

Almost surely, 2^646244561140 is an apocalyptic number.

It is an amenable number.

646244561140 is an abundant number, since it is smaller than the sum of its proper divisors (755248563164).

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

646244561140 is a wasteful number, since it uses less digits than its factorization.

646244561140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4825108 (or 4825106 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 646244561140 in words is "six hundred forty-six billion, two hundred forty-four million, five hundred sixty-one thousand, one hundred forty".