5661656670 has 64 divisors (see below), whose sum is σ = 14391118080. Its totient is φ = 1421515008.

The previous prime is 5661656641. The next prime is 5661656681. The reversal of 5661656670 is 766561665.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62442 + ... + 123378.

It is an arithmetic number, because the mean of its divisors is an integer number (224861220).

Almost surely, 2^5661656670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661656670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7195559040).

5661656670 is an abundant number, since it is smaller than the sum of its proper divisors (8729461410).

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

5661656670 is a wasteful number, since it uses less digits than its factorization.

5661656670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61129.

The product of its (nonzero) digits is 1360800, while the sum is 48.

The square root of 5661656670 is about 75243.9809552897. The cubic root of 5661656670 is about 1782.3015162177.

The spelling of 5661656670 in words is "five billion, six hundred sixty-one million, six hundred fifty-six thousand, six hundred seventy".