656524051321 has 2 divisors, whose sum is σ = 656524051322. Its totient is φ = 656524051320.

The previous prime is 656524051319. The next prime is 656524051327. The reversal of 656524051321 is 123150425656.

656524051321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404319211321 + 252204840000 = 635861^2 + 502200^2 .

It is a cyclic number.

It is not a de Polignac number, because 656524051321 - 2¹ = 656524051319 is a prime.

Together with 656524051319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (656524051327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328262025660 + 328262025661.

It is an arithmetic number, because the mean of its divisors is an integer number (328262025661).

Almost surely, 2^656524051321 is an apocalyptic number.

It is an amenable number.

656524051321 is a deficient number, since it is larger than the sum of its proper divisors (1).

656524051321 is an equidigital number, since it uses as much as digits as its factorization.

656524051321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 40.

Adding to 656524051321 its reverse (123150425656), we get a palindrome (779674476977).

The spelling of 656524051321 in words is "six hundred fifty-six billion, five hundred twenty-four million, fifty-one thousand, three hundred twenty-one".