166227635377399 has 2 divisors, whose sum is σ = 166227635377400. Its totient is φ = 166227635377398.

The previous prime is 166227635377351. The next prime is 166227635377409. The reversal of 166227635377399 is 993773536722661.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (993773536722661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166227635377399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166227635377099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83113817688699 + 83113817688700.

It is an arithmetic number, because the mean of its divisors is an integer number (83113817688700).

Almost surely, 2^{166227635377399} is an apocalyptic number.

166227635377399 is a deficient number, since it is larger than the sum of its proper divisors (1).

166227635377399 is an equidigital number, since it uses as much as digits as its factorization.

166227635377399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240609120, while the sum is 76.

The spelling of 166227635377399 in words is "one hundred sixty-six trillion, two hundred twenty-seven billion, six hundred thirty-five million, three hundred seventy-seven thousand, three hundred ninety-nine".