5660651581 has 8 divisors (see below), whose sum is σ = 6103451480. Its totient is φ = 5218903872.

The previous prime is 5660651567. The next prime is 5660651597. The reversal of 5660651581 is 1851560665.

It can be written as a sum of positive squares in 4 ways, for example, as 1501562500 + 4159089081 = 38750^2 + 64491^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5660651581 - 2⁷ = 5660651453 is a prime.

It is a super-2 number, since 2×5660651581² = 64085952642955599122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5660651501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251850 + ... + 273403.

It is an arithmetic number, because the mean of its divisors is an integer number (762931435).

Almost surely, 2^5660651581 is an apocalyptic number.

It is an amenable number.

5660651581 is a deficient number, since it is larger than the sum of its proper divisors (442799899).

5660651581 is a wasteful number, since it uses less digits than its factorization.

5660651581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526095.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 5660651581 is about 75237.3017923955. The cubic root of 5660651581 is about 1782.1960419270.

The spelling of 5660651581 in words is "five billion, six hundred sixty million, six hundred fifty-one thousand, five hundred eighty-one".