1650000000 has 288 divisors, whose sum is σ = 5976559440. Its totient is φ = 400000000.

The previous prime is 1649999987. The next prime is 1650000049. The reversal of 1650000000 is 561.

It is a hoax number, since the sum of its digits (12) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a zygodrome in base 5.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 149999995 + ... + 150000005.

Almost surely, 2^1650000000 is an apocalyptic number.

1650000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1650000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2988279720).

1650000000 is an abundant number, since it is smaller than the sum of its proper divisors (4326559440).

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

1650000000 is an frugal number, since it uses more digits than its factorization.

1650000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 1650000000 is about 40620.1920231798. The cubic root of 1650000000 is about 1181.6657504675.

Adding to 1650000000 its reverse (561), we get a palindrome (1650000561).

The spelling of 1650000000 in words is "one billion, six hundred fifty million", and thus it is an aban number.