616666447 has 2 divisors, whose sum is σ = 616666448. Its totient is φ = 616666446.

The previous prime is 616666441. The next prime is 616666549. The reversal of 616666447 is 744666616.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616666447 - 2³ = 616666439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 616666397 and 616666406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616666441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308333223 + 308333224.

It is an arithmetic number, because the mean of its divisors is an integer number (308333224).

Almost surely, 2^616666447 is an apocalyptic number.

616666447 is a deficient number, since it is larger than the sum of its proper divisors (1).

616666447 is an equidigital number, since it uses as much as digits as its factorization.

616666447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 46.

The square root of 616666447 is about 24832.7696200001. The cubic root of 616666447 is about 851.1709108478.

The spelling of 616666447 in words is "six hundred sixteen million, six hundred sixty-six thousand, four hundred forty-seven".