616517854821 has 40 divisors (see below), whose sum is σ = 1007433888384. Its totient is φ = 372628874880.

The previous prime is 616517854811. The next prime is 616517854861. The reversal of 616517854821 is 128458715616.

616517854821 is a `hidden beast` number, since 6 + 1 + 6 + 5 + 1 + 78 + 548 + 21 = 666.

It is not a de Polignac number, because 616517854821 - 2⁵ = 616517854789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616517854811) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 615700 + ... + 1269693.

Almost surely, 2^616517854821 is an apocalyptic number.

It is an amenable number.

616517854821 is a deficient number, since it is larger than the sum of its proper divisors (390916033563).

616517854821 is a wasteful number, since it uses less digits than its factorization.

616517854821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885783 (or 1885774 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 54.

The spelling of 616517854821 in words is "six hundred sixteen billion, five hundred seventeen million, eight hundred fifty-four thousand, eight hundred twenty-one".