1661413320 has 192 divisors, whose sum is σ = 6200064000. Its totient is φ = 377961984.

The previous prime is 1661413301. The next prime is 1661413321. The reversal of 1661413320 is 233141661.

1661413320 is a `hidden beast` number, since 1 + 6 + 614 + 13 + 32 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (1661413321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 575641 + ... + 578519.

It is an arithmetic number, because the mean of its divisors is an integer number (32292000).

Almost surely, 2^1661413320 is an apocalyptic number.

1661413320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661413320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3100032000).

1661413320 is an abundant number, since it is smaller than the sum of its proper divisors (4538650680).

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

1661413320 is a wasteful number, since it uses less digits than its factorization.

1661413320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132 (or 3125 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1661413320 is about 40760.4381723259. The cubic root of 1661413320 is about 1184.3840841356.

Adding to 1661413320 its reverse (233141661), we get a palindrome (1894554981).

The spelling of 1661413320 in words is "one billion, six hundred sixty-one million, four hundred thirteen thousand, three hundred twenty".