1897413329657 has 2 divisors, whose sum is σ = 1897413329658. Its totient is φ = 1897413329656.

The previous prime is 1897413329639. The next prime is 1897413329687. The reversal of 1897413329657 is 7569233147981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1490294042176 + 407119287481 = 1220776^2 + 638059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897413329657 - 2⁸ = 1897413329401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1897413329593 and 1897413329602.

It is not a weakly prime, because it can be changed into another prime (1897413329687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948706664828 + 948706664829.

It is an arithmetic number, because the mean of its divisors is an integer number (948706664829).

Almost surely, 2^{1897413329657} is an apocalyptic number.

It is an amenable number.

1897413329657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897413329657 is an equidigital number, since it uses as much as digits as its factorization.

1897413329657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68584320, while the sum is 65.

The spelling of 1897413329657 in words is "one trillion, eight hundred ninety-seven billion, four hundred thirteen million, three hundred twenty-nine thousand, six hundred fifty-seven".