642116650 has 24 divisors (see below), whose sum is σ = 1364957280. Its totient is φ = 220154160.

The previous prime is 642116633. The next prime is 642116659. The reversal of 642116650 is 56611246.

It is not an unprimeable number, because it can be changed into a prime (642116659) 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, 916960 + ... + 917659.

It is an arithmetic number, because the mean of its divisors is an integer number (56873220).

Almost surely, 2^642116650 is an apocalyptic number.

642116650 is an abundant number, since it is smaller than the sum of its proper divisors (722840630).

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

642116650 is a wasteful number, since it uses less digits than its factorization.

642116650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834638 (or 1834633 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 642116650 is about 25340.0207182236. The cubic root of 642116650 is about 862.7228689620.

Adding to 642116650 its reverse (56611246), we get a palindrome (698727896).

The spelling of 642116650 in words is "six hundred forty-two million, one hundred sixteen thousand, six hundred fifty".