1661065002 has 64 divisors (see below), whose sum is σ = 4034534400. Its totient is φ = 504299520.

The previous prime is 1661064989. The next prime is 1661065027. The reversal of 1661065002 is 2005601661.

It is a happy number.

1661065002 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 0 + 650 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 727 + ... + 57642.

It is an arithmetic number, because the mean of its divisors is an integer number (63039600).

Almost surely, 2^1661065002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661065002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2017267200).

1661065002 is an abundant number, since it is smaller than the sum of its proper divisors (2373469398).

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

1661065002 is a wasteful number, since it uses less digits than its factorization.

1661065002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58428 (or 58422 counting only the distinct ones).

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

The square root of 1661065002 is about 40756.1652023347. The cubic root of 1661065002 is about 1184.3013090020.

Adding to 1661065002 its reverse (2005601661), we get a palindrome (3666666663).

The spelling of 1661065002 in words is "one billion, six hundred sixty-one million, sixty-five thousand, two".