655778947 has 2 divisors, whose sum is σ = 655778948. Its totient is φ = 655778946.

The previous prime is 655778917. The next prime is 655778951. The reversal of 655778947 is 749877556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655778947 - 2⁷ = 655778819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 655778891 and 655778900.

It is not a weakly prime, because it can be changed into another prime (655778917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327889473 + 327889474.

It is an arithmetic number, because the mean of its divisors is an integer number (327889474).

Almost surely, 2^655778947 is an apocalyptic number.

655778947 is a deficient number, since it is larger than the sum of its proper divisors (1).

655778947 is an equidigital number, since it uses as much as digits as its factorization.

655778947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14817600, while the sum is 58.

The square root of 655778947 is about 25608.1812513111. The cubic root of 655778947 is about 868.7986885605.

The spelling of 655778947 in words is "six hundred fifty-five million, seven hundred seventy-eight thousand, nine hundred forty-seven".