616561366 has 4 divisors (see below), whose sum is σ = 924842052. Its totient is φ = 308280682.

The previous prime is 616561357. The next prime is 616561397. The reversal of 616561366 is 663165616.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154140340 + ... + 154140343.

It is an arithmetic number, because the mean of its divisors is an integer number (231210513).

Almost surely, 2^616561366 is an apocalyptic number.

616561366 is a deficient number, since it is larger than the sum of its proper divisors (308280686).

616561366 is a wasteful number, since it uses less digits than its factorization.

616561366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308280685.

The product of its digits is 116640, while the sum is 40.

The square root of 616561366 is about 24830.6537569996. The cubic root of 616561366 is about 851.1225611163.

The spelling of 616561366 in words is "six hundred sixteen million, five hundred sixty-one thousand, three hundred sixty-six".