1657216444253 has 2 divisors, whose sum is σ = 1657216444254. Its totient is φ = 1657216444252.

The previous prime is 1657216444237. The next prime is 1657216444297. The reversal of 1657216444253 is 3524446127561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1473691597849 + 183524846404 = 1213957^2 + 428398^2 .

It is a cyclic number.

It is not a de Polignac number, because 1657216444253 - 2⁴ = 1657216444237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1657216444153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828608222126 + 828608222127.

It is an arithmetic number, because the mean of its divisors is an integer number (828608222127).

Almost surely, 2^{1657216444253} is an apocalyptic number.

It is an amenable number.

1657216444253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1657216444253 is an equidigital number, since it uses as much as digits as its factorization.

1657216444253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4838400, while the sum is 50.

The spelling of 1657216444253 in words is "one trillion, six hundred fifty-seven billion, two hundred sixteen million, four hundred forty-four thousand, two hundred fifty-three".