166557000347291 has 2 divisors, whose sum is σ = 166557000347292. Its totient is φ = 166557000347290.

The previous prime is 166557000347263. The next prime is 166557000347329. The reversal of 166557000347291 is 192743000755661.

It is a weak prime.

It is an emirp because it is prime and its reverse (192743000755661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166557000347291 is a prime.

It is a super-2 number, since 2×166557000347291² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166557000347251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83278500173645 + 83278500173646.

It is an arithmetic number, because the mean of its divisors is an integer number (83278500173646).

Almost surely, 2^{166557000347291} is an apocalyptic number.

166557000347291 is a deficient number, since it is larger than the sum of its proper divisors (1).

166557000347291 is an equidigital number, since it uses as much as digits as its factorization.

166557000347291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9525600, while the sum is 56.

The spelling of 166557000347291 in words is "one hundred sixty-six trillion, five hundred fifty-seven billion, three hundred forty-seven thousand, two hundred ninety-one".