1661044002 has 16 divisors (see below), whose sum is σ = 3342470880. Its totient is φ = 550284192.

The previous prime is 1661044001. The next prime is 1661044003. The reversal of 1661044002 is 2004401661.

It is an interprime number because it is at equal distance from previous prime (1661044001) and next prime (1661044003).

It is not an unprimeable number, because it can be changed into a prime (1661044001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848227 + ... + 850182.

It is an arithmetic number, because the mean of its divisors is an integer number (208904430).

Almost surely, 2^1661044002 is an apocalyptic number.

1661044002 is an abundant number, since it is smaller than the sum of its proper divisors (1681426878).

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

1661044002 is a wasteful number, since it uses less digits than its factorization.

1661044002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698577.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1661044002 is about 40755.9075717864. The cubic root of 1661044002 is about 1184.2963181412.

Adding to 1661044002 its reverse (2004401661), we get a palindrome (3665445663).

The spelling of 1661044002 in words is "one billion, six hundred sixty-one million, forty-four thousand, two".