1656885625 has 10 divisors (see below), whose sum is σ = 2070445058.
Its totient is φ = 1325508000.
The previous prime is 1656885611. The next prime is 1656885649. The reversal of 1656885625 is 5265886561.
It can be written as a sum of positive squares in 5 ways, for example, as 286997481 + 1369888144 = 16941^2 + 37012^2
It is a de Polignac number, because none of the positive numbers 2k-1656885625 is a prime.
It is a Duffinian number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1324884 + ... + 1326133.
Almost surely, 21656885625 is an apocalyptic number.
It is an amenable number.
1656885625 is a deficient number, since it is larger than the sum of its proper divisors (413559433).
1656885625 is an frugal number, since it uses more digits than its factorization.
1656885625 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2651037 (or 2651022 counting only the distinct ones).
The product of its digits is 3456000, while the sum is 52.
The square root of 1656885625 is about 40704.8599678220.
The cubic root of 1656885625 is about 1183.3072080899.
The spelling of 1656885625 in words is "one billion, six hundred fifty-six million, eight hundred eighty-five thousand, six hundred twenty-five".