656600381 has 2 divisors, whose sum is σ = 656600382. Its totient is φ = 656600380.

The previous prime is 656600377. The next prime is 656600393. The reversal of 656600381 is 183006656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 527437156 + 129163225 = 22966^2 + 11365^2 .

It is a cyclic number.

It is not a de Polignac number, because 656600381 - 2² = 656600377 is a prime.

It is a super-2 number, since 2×656600381² = 862248120658690322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656600341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328300190 + 328300191.

It is an arithmetic number, because the mean of its divisors is an integer number (328300191).

Almost surely, 2^656600381 is an apocalyptic number.

It is an amenable number.

656600381 is a deficient number, since it is larger than the sum of its proper divisors (1).

656600381 is an equidigital number, since it uses as much as digits as its factorization.

656600381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 656600381 is about 25624.2147391876. The cubic root of 656600381 is about 869.1612919516.

The spelling of 656600381 in words is "six hundred fifty-six million, six hundred thousand, three hundred eighty-one".