616857444671 has 4 divisors (see below), whose sum is σ = 664308017352. Its totient is φ = 569406871992.

The previous prime is 616857444661. The next prime is 616857444703. The reversal of 616857444671 is 176444758616.

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

It is a cyclic number.

It is not a de Polignac number, because 616857444671 - 2¹⁰ = 616857443647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 616857444671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616857444661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23725286321 + ... + 23725286346.

It is an arithmetic number, because the mean of its divisors is an integer number (166077004338).

Almost surely, 2^616857444671 is an apocalyptic number.

616857444671 is a deficient number, since it is larger than the sum of its proper divisors (47450572681).

616857444671 is a wasteful number, since it uses less digits than its factorization.

616857444671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47450572680.

The product of its digits is 27095040, while the sum is 59.

The spelling of 616857444671 in words is "six hundred sixteen billion, eight hundred fifty-seven million, four hundred forty-four thousand, six hundred seventy-one".