1661323446 has 48 divisors (see below), whose sum is σ = 3756798864. Its totient is φ = 550221984.

The previous prime is 1661323399. The next prime is 1661323457. The reversal of 1661323446 is 6443231661.

1661323446 is a `hidden beast` number, since 1 + 6 + 613 + 2 + 34 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1661323446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65416 + ... + 87188.

It is an arithmetic number, because the mean of its divisors is an integer number (78266643).

Almost surely, 2^1661323446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661323446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1878399432).

1661323446 is an abundant number, since it is smaller than the sum of its proper divisors (2095475418).

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

1661323446 is a wasteful number, since it uses less digits than its factorization.

1661323446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21947 (or 21935 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 1661323446 is about 40759.3356913481. The cubic root of 1661323446 is about 1184.3627273680.

The spelling of 1661323446 in words is "one billion, six hundred sixty-one million, three hundred twenty-three thousand, four hundred forty-six".