616006661 has 8 divisors (see below), whose sum is σ = 644928480. Its totient is φ = 587596912.

The previous prime is 616006649. The next prime is 616006697. The reversal of 616006661 is 166600616.

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

It is a cyclic number.

It is not a de Polignac number, because 616006661 - 2¹⁸ = 615744517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616006361) 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, 125555 + ... + 130368.

It is an arithmetic number, because the mean of its divisors is an integer number (80616060).

Almost surely, 2^616006661 is an apocalyptic number.

It is an amenable number.

616006661 is a deficient number, since it is larger than the sum of its proper divisors (28921819).

616006661 is a wasteful number, since it uses less digits than its factorization.

616006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256035.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 616006661 is about 24819.4814812880. The cubic root of 616006661 is about 850.8672398984.

The spelling of 616006661 in words is "six hundred sixteen million, six thousand, six hundred sixty-one".