616386665 has 8 divisors (see below), whose sum is σ = 739912968. Its totient is φ = 492943360.

The previous prime is 616386653. The next prime is 616386689. The reversal of 616386665 is 566683616.

It can be written as a sum of positive squares in 4 ways, for example, as 251920384 + 364466281 = 15872^2 + 19091^2 .

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

It is not a de Polignac number, because 616386665 - 2⁴ = 616386649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3032 + ... + 35241.

It is an arithmetic number, because the mean of its divisors is an integer number (92489121).

Almost surely, 2^616386665 is an apocalyptic number.

It is an amenable number.

616386665 is a deficient number, since it is larger than the sum of its proper divisors (123526303).

616386665 is a wasteful number, since it uses less digits than its factorization.

616386665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41499.

The product of its digits is 933120, while the sum is 47.

The square root of 616386665 is about 24827.1356583880. The cubic root of 616386665 is about 851.0421657619.

The spelling of 616386665 in words is "six hundred sixteen million, three hundred eighty-six thousand, six hundred sixty-five".