501651600640 has 36 divisors (see below), whose sum is σ = 1201612352724. Its totient is φ = 200660639744.

The previous prime is 501651600629. The next prime is 501651600647. The reversal of 501651600640 is 46006156105.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 166216028416 + 335435572224 = 407696^2 + 579168^2 .

It is a junction number, because it is equal to n+sod(n) for n = 501651600596 and 501651600605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501651600647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195956377 + ... + 195958936.

It is an arithmetic number, because the mean of its divisors is an integer number (33378120909).

Almost surely, 2^501651600640 is an apocalyptic number.

It is an amenable number.

501651600640 is an abundant number, since it is smaller than the sum of its proper divisors (699960752084).

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

501651600640 is an equidigital number, since it uses as much as digits as its factorization.

501651600640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391915334 (or 391915320 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 501651600640 its reverse (46006156105), we get a palindrome (547657756745).

The spelling of 501651600640 in words is "five hundred one billion, six hundred fifty-one million, six hundred thousand, six hundred forty".