1668518501357 has 2 divisors, whose sum is σ = 1668518501358. Its totient is φ = 1668518501356.

The previous prime is 1668518501339. The next prime is 1668518501399. The reversal of 1668518501357 is 7531058158661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1633933288516 + 34585212841 = 1278254^2 + 185971^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668518501357 - 2⁸ = 1668518501101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668518501327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834259250678 + 834259250679.

It is an arithmetic number, because the mean of its divisors is an integer number (834259250679).

Almost surely, 2^{1668518501357} is an apocalyptic number.

It is an amenable number.

1668518501357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668518501357 is an equidigital number, since it uses as much as digits as its factorization.

1668518501357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048000, while the sum is 56.

The spelling of 1668518501357 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, five hundred one thousand, three hundred fifty-seven".