1665610002 has 96 divisors (see below), whose sum is σ = 4264191360. Its totient is φ = 460028160.

The previous prime is 1665609973. The next prime is 1665610007. The reversal of 1665610002 is 2000165661.

It is a happy number.

1665610002 is a `hidden beast` number, since 1 + 6 + 656 + 1 + 0 + 0 + 0 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (1665610007) 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 47 ways as a sum of consecutive naturals, for example, 451638 + ... + 455310.

It is an arithmetic number, because the mean of its divisors is an integer number (44418660).

Almost surely, 2^1665610002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665610002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2132095680).

1665610002 is an abundant number, since it is smaller than the sum of its proper divisors (2598581358).

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

1665610002 is a wasteful number, since it uses less digits than its factorization.

1665610002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3808 (or 3805 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1665610002 is about 40811.8855482076. The cubic root of 1665610002 is about 1185.3804856273.

Adding to 1665610002 its reverse (2000165661), we get a palindrome (3665775663).

The spelling of 1665610002 in words is "one billion, six hundred sixty-five million, six hundred ten thousand, two".