650000000000000 has 420 divisors, whose sum is σ = 1749893188419222. Its totient is φ = 240000000000000.

The previous prime is 649999999999957. The next prime is 650000000000003. The reversal of 650000000000000 is 56.

It can be written as a sum of positive squares in 15 ways, for example, as 649928535740416 + 71464259584 = 25493696^2 + 267328^2 .

It is a sliding number, since 650000000000000 = 250000000000000 + 400000000000000 and 1/250000000000000 + 1/400000000000000 = 0.00000000000000650000000000000.

It is a hoax number, since the sum of its digits (11) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (650000000000003) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 49999999999994 + ... + 50000000000006.

Almost surely, 2^{650000000000000} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 650000000000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874946594209611).

650000000000000 is an abundant number, since it is smaller than the sum of its proper divisors (1099893188419222).

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

650000000000000 is an frugal number, since it uses more digits than its factorization.

650000000000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 20 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

Adding to 650000000000000 its reverse (56), we get a palindrome (650000000000056).

The spelling of 650000000000000 in words is "six hundred fifty trillion", and thus it is an aban number.