1661044602 has 64 divisors (see below), whose sum is σ = 4042531584. Its totient is φ = 444165120.

The previous prime is 1661044601. The next prime is 1661044631. The reversal of 1661044602 is 2064401661.

It is a self number, because there is not a number n which added to its sum of digits gives 1661044602.

It is not an unprimeable number, because it can be changed into a prime (1661044601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122808 + ... + 135660.

It is an arithmetic number, because the mean of its divisors is an integer number (63164556).

Almost surely, 2^1661044602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661044602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2021265792).

1661044602 is an abundant number, since it is smaller than the sum of its proper divisors (2381486982).

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

1661044602 is a wasteful number, since it uses less digits than its factorization.

1661044602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13063.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1661044602 is about 40755.9149326819. The cubic root of 1661044602 is about 1184.2964607378.

The spelling of 1661044602 in words is "one billion, six hundred sixty-one million, forty-four thousand, six hundred two".