642260516650 has 24 divisors (see below), whose sum is σ = 1223741261484. Its totient is φ = 250638249600.

The previous prime is 642260516593. The next prime is 642260516657. The reversal of 642260516650 is 56615062246.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 176974186489 + 465286330161 = 420683^2 + 682119^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642260516597 and 642260516606.

It is not an unprimeable number, because it can be changed into a prime (642260516657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156646857 + ... + 156650956.

Almost surely, 2^642260516650 is an apocalyptic number.

642260516650 is a deficient number, since it is larger than the sum of its proper divisors (581480744834).

642260516650 is a wasteful number, since it uses less digits than its factorization.

642260516650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313297866 (or 313297861 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

Adding to 642260516650 its reverse (56615062246), we get a palindrome (698875578896).

The spelling of 642260516650 in words is "six hundred forty-two billion, two hundred sixty million, five hundred sixteen thousand, six hundred fifty".