165166550111 has 2 divisors, whose sum is σ = 165166550112. Its totient is φ = 165166550110.

The previous prime is 165166550093. The next prime is 165166550239. The reversal of 165166550111 is 111055661561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165166550111 - 2⁶ = 165166550047 is a prime.

It is a super-2 number, since 2×165166550111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165166550011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82583275055 + 82583275056.

It is an arithmetic number, because the mean of its divisors is an integer number (82583275056).

Almost surely, 2^165166550111 is an apocalyptic number.

165166550111 is a deficient number, since it is larger than the sum of its proper divisors (1).

165166550111 is an equidigital number, since it uses as much as digits as its factorization.

165166550111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 165166550111 in words is "one hundred sixty-five billion, one hundred sixty-six million, five hundred fifty thousand, one hundred eleven".