5661662320 has 80 divisors (see below), whose sum is σ = 13980899808. Its totient is φ = 2124840960.

The previous prime is 5661662297. The next prime is 5661662323. The reversal of 5661662320 is 232661665.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 5661662320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661662323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443872 + ... + 456448.

Almost surely, 2^5661662320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661662320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6990449904).

5661662320 is an abundant number, since it is smaller than the sum of its proper divisors (8319237488).

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

5661662320 is a wasteful number, since it uses less digits than its factorization.

5661662320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12938 (or 12932 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 5661662320 is about 75244.0184998117. The cubic root of 5661662320 is about 1782.3021090948.

The spelling of 5661662320 in words is "five billion, six hundred sixty-one million, six hundred sixty-two thousand, three hundred twenty".