616655587 has 2 divisors, whose sum is σ = 616655588. Its totient is φ = 616655586.

The previous prime is 616655581. The next prime is 616655591. The reversal of 616655587 is 785556616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616655587 is a prime.

It is a super-2 number, since 2×616655587² = 760528225956629138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 616655587.

It is not a weakly prime, because it can be changed into another prime (616655581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308327793 + 308327794.

It is an arithmetic number, because the mean of its divisors is an integer number (308327794).

Almost surely, 2^616655587 is an apocalyptic number.

616655587 is a deficient number, since it is larger than the sum of its proper divisors (1).

616655587 is an equidigital number, since it uses as much as digits as its factorization.

616655587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512000, while the sum is 49.

The square root of 616655587 is about 24832.5509563557. The cubic root of 616655587 is about 851.1659142133.

The spelling of 616655587 in words is "six hundred sixteen million, six hundred fifty-five thousand, five hundred eighty-seven".