1656672500 has 120 divisors (see below), whose sum is σ = 4176613056. Its totient is φ = 563040000.

The previous prime is 1656672499. The next prime is 1656672517. The reversal of 1656672500 is 52766561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2397155 + ... + 2397845.

Almost surely, 2^1656672500 is an apocalyptic number.

1656672500 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 1656672500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088306528).

1656672500 is an abundant number, since it is smaller than the sum of its proper divisors (2519940556).

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

1656672500 is a wasteful number, since it uses less digits than its factorization.

1656672500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 1656672500 is about 40702.2419529932. The cubic root of 1656672500 is about 1183.2564696928.

The spelling of 1656672500 in words is "one billion, six hundred fifty-six million, six hundred seventy-two thousand, five hundred".