5615631666 has 80 divisors (see below), whose sum is σ = 13083507360. Its totient is φ = 1798822080.

The previous prime is 5615631629. The next prime is 5615631667. The reversal of 5615631666 is 6661365165.

It is not an unprimeable number, because it can be changed into a prime (5615631667) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 438705 + ... + 451323.

It is an arithmetic number, because the mean of its divisors is an integer number (163543842).

Almost surely, 2^5615631666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5615631666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6541753680).

5615631666 is an abundant number, since it is smaller than the sum of its proper divisors (7467875694).

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

5615631666 is a wasteful number, since it uses less digits than its factorization.

5615631666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12741 (or 12732 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 5615631666 is about 74937.5184136758. The cubic root of 5615631666 is about 1777.4587802224.

The spelling of 5615631666 in words is "five billion, six hundred fifteen million, six hundred thirty-one thousand, six hundred sixty-six".