221534456134657 has 2 divisors, whose sum is σ = 221534456134658. Its totient is φ = 221534456134656.

The previous prime is 221534456134633. The next prime is 221534456134697. The reversal of 221534456134657 is 756431654435122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152858827504881 + 68675628629776 = 12363609^2 + 8287076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221534456134657 is a prime.

It is not a weakly prime, because it can be changed into another prime (221534456134697) 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, 110767228067328 + 110767228067329.

It is an arithmetic number, because the mean of its divisors is an integer number (110767228067329).

Almost surely, 2^{221534456134657} is an apocalyptic number.

It is an amenable number.

221534456134657 is a deficient number, since it is larger than the sum of its proper divisors (1).

221534456134657 is an equidigital number, since it uses as much as digits as its factorization.

221534456134657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576000, while the sum is 58.

The spelling of 221534456134657 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred fifty-six million, one hundred thirty-four thousand, six hundred fifty-seven".