656641147 has 2 divisors, whose sum is σ = 656641148. Its totient is φ = 656641146.

The previous prime is 656641129. The next prime is 656641169. The reversal of 656641147 is 741146656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656641147 - 2⁷ = 656641019 is a prime.

It is not a weakly prime, because it can be changed into another prime (656641177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328320573 + 328320574.

It is an arithmetic number, because the mean of its divisors is an integer number (328320574).

Almost surely, 2^656641147 is an apocalyptic number.

656641147 is a deficient number, since it is larger than the sum of its proper divisors (1).

656641147 is an equidigital number, since it uses as much as digits as its factorization.

656641147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 656641147 is about 25625.0101853638. The cubic root of 656641147 is about 869.1792792983.

The spelling of 656641147 in words is "six hundred fifty-six million, six hundred forty-one thousand, one hundred forty-seven".