1656500000 has 84 divisors (see below), whose sum is σ = 4077721242. Its totient is φ = 662400000.

The previous prime is 1656499987. The next prime is 1656500003. The reversal of 1656500000 is 56561.

It can be written as a sum of positive squares in 7 ways, for example, as 475065616 + 1181434384 = 21796^2 + 34372^2 .

It is not an unprimeable number, because it can be changed into a prime (1656500003) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 498344 + ... + 501656.

Almost surely, 2^1656500000 is an apocalyptic number.

1656500000 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 1656500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2038860621).

1656500000 is an abundant number, since it is smaller than the sum of its proper divisors (2421221242).

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

1656500000 is an frugal number, since it uses more digits than its factorization.

1656500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353 (or 3320 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1656500000 is about 40700.1228499374. The cubic root of 1656500000 is about 1183.2153996511.

Adding to 1656500000 its reverse (56561), we get a palindrome (1656556561).

The spelling of 1656500000 in words is "one billion, six hundred fifty-six million, five hundred thousand".