616657 has 4 divisors (see below), whose sum is σ = 619120. Its totient is φ = 614196.

The previous prime is 616643. The next prime is 616669. The reversal of 616657 is 756616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 616657 - 2⁷ = 616529 is a prime.

It is a Duffinian number.

616657 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (616157) 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, 807 + ... + 1372.

It is an arithmetic number, because the mean of its divisors is an integer number (154780).

2⁶¹⁶⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

616657 is a deficient number, since it is larger than the sum of its proper divisors (2463).

616657 is a wasteful number, since it uses less digits than its factorization.

616657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462.

The product of its digits is 7560, while the sum is 31.

The square root of 616657 is about 785.2751110280. The cubic root of 616657 is about 85.1166564331.

The spelling of 616657 in words is "six hundred sixteen thousand, six hundred fifty-seven".