5601215666 has 8 divisors (see below), whose sum is σ = 8426755740. Its totient is φ = 2792297088.

The previous prime is 5601215663. The next prime is 5601215671. The reversal of 5601215666 is 6665121065.

It can be written as a sum of positive squares in 2 ways, for example, as 5066450041 + 534765625 = 71179^2 + 23125^2 .

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

It is not an unprimeable number, because it can be changed into a prime (5601215663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4154531 + ... + 4155878.

Almost surely, 2^5601215666 is an apocalyptic number.

5601215666 is a deficient number, since it is larger than the sum of its proper divisors (2825540074).

5601215666 is a wasteful number, since it uses less digits than its factorization.

5601215666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8310748.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 5601215666 is about 74841.2698048343. The cubic root of 5601215666 is about 1775.9364935578.

The spelling of 5601215666 in words is "five billion, six hundred one million, two hundred fifteen thousand, six hundred sixty-six".