616255917 has 4 divisors (see below), whose sum is σ = 821674560. Its totient is φ = 410837276.

The previous prime is 616255891. The next prime is 616255987. The reversal of 616255917 is 719552616.

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 616255917 - 2¹⁸ = 615993773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616255987) 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, 102709317 + ... + 102709322.

It is an arithmetic number, because the mean of its divisors is an integer number (205418640).

Almost surely, 2^616255917 is an apocalyptic number.

It is an amenable number.

616255917 is a deficient number, since it is larger than the sum of its proper divisors (205418643).

616255917 is a wasteful number, since it uses less digits than its factorization.

616255917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205418642.

The product of its digits is 113400, while the sum is 42.

The square root of 616255917 is about 24824.5023515075. The cubic root of 616255917 is about 850.9819871240.

The spelling of 616255917 in words is "six hundred sixteen million, two hundred fifty-five thousand, nine hundred seventeen".