1656325665 has 96 divisors (see below), whose sum is σ = 3160859520. Its totient is φ = 829730304.

The previous prime is 1656325661. The next prime is 1656325711. The reversal of 1656325665 is 5665236561.

1656325665 is a `hidden beast` number, since 1 + 6 + 5 + 632 + 5 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 1656325665 - 2² = 1656325661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1656325665.

It is not an unprimeable number, because it can be changed into a prime (1656325661) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 3624117 + ... + 3624573.

It is an arithmetic number, because the mean of its divisors is an integer number (32925620).

Almost surely, 2^1656325665 is an apocalyptic number.

1656325665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1656325665 is a deficient number, since it is larger than the sum of its proper divisors (1504533855).

1656325665 is a wasteful number, since it uses less digits than its factorization.

1656325665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 641 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 1656325665 is about 40697.9810924326. The cubic root of 1656325665 is about 1183.1738898225.

The spelling of 1656325665 in words is "one billion, six hundred fifty-six million, three hundred twenty-five thousand, six hundred sixty-five".