656001145 has 4 divisors (see below), whose sum is σ = 787201380. Its totient is φ = 524800912.

The previous prime is 656001139. The next prime is 656001149. The reversal of 656001145 is 541100656.

656001145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 176916601 + 479084544 = 13301^2 + 21888^2 .

It is a cyclic number.

It is not a de Polignac number, because 656001145 - 2⁹ = 656000633 is a prime.

It is a super-2 number, since 2×656001145² = 860675004482622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656001149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65600110 + ... + 65600119.

It is an arithmetic number, because the mean of its divisors is an integer number (196800345).

Almost surely, 2^656001145 is an apocalyptic number.

It is an amenable number.

656001145 is a deficient number, since it is larger than the sum of its proper divisors (131200235).

656001145 is a wasteful number, since it uses less digits than its factorization.

656001145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131200234.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 656001145 is about 25612.5193020913. The cubic root of 656001145 is about 868.8968026851.

The spelling of 656001145 in words is "six hundred fifty-six million, one thousand, one hundred forty-five".