656505601001 has 4 divisors (see below), whose sum is σ = 656525952900. Its totient is φ = 656485249104.

The previous prime is 656505600997. The next prime is 656505601039. The reversal of 656505601001 is 100106505656.

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 269621601001 + 386884000000 = 519251^2 + 622000^2 .

It is a cyclic number.

It is not a de Polignac number, because 656505601001 - 2² = 656505600997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656505600001) 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, 10127486 + ... + 10192103.

It is an arithmetic number, because the mean of its divisors is an integer number (164131488225).

Almost surely, 2^656505601001 is an apocalyptic number.

It is an amenable number.

656505601001 is a deficient number, since it is larger than the sum of its proper divisors (20351899).

656505601001 is a wasteful number, since it uses less digits than its factorization.

656505601001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20351898.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 656505601001 in words is "six hundred fifty-six billion, five hundred five million, six hundred one thousand, one".