656278873 has 2 divisors, whose sum is σ = 656278874. Its totient is φ = 656278872.

The previous prime is 656278871. The next prime is 656278901. The reversal of 656278873 is 378872656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 471237264 + 185041609 = 21708^2 + 13603^2 .

It is a cyclic number.

It is not a de Polignac number, because 656278873 - 2¹ = 656278871 is a prime.

Together with 656278871, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 656278873.

It is not a weakly prime, because it can be changed into another prime (656278871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328139436 + 328139437.

It is an arithmetic number, because the mean of its divisors is an integer number (328139437).

Almost surely, 2^656278873 is an apocalyptic number.

It is an amenable number.

656278873 is a deficient number, since it is larger than the sum of its proper divisors (1).

656278873 is an equidigital number, since it uses as much as digits as its factorization.

656278873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 52.

The square root of 656278873 is about 25617.9404519567. The cubic root of 656278873 is about 869.0194055829.

The spelling of 656278873 in words is "six hundred fifty-six million, two hundred seventy-eight thousand, eight hundred seventy-three".