166165523 has 2 divisors, whose sum is σ = 166165524. Its totient is φ = 166165522.

The previous prime is 166165481. The next prime is 166165567. The reversal of 166165523 is 325561661.

It is a weak prime.

It is an emirp because it is prime and its reverse (325561661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166165523 - 2⁸ = 166165267 is a prime.

It is a super-2 number, since 2×166165523² = 55221962067727058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166165423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83082761 + 83082762.

It is an arithmetic number, because the mean of its divisors is an integer number (83082762).

Almost surely, 2^166165523 is an apocalyptic number.

166165523 is a deficient number, since it is larger than the sum of its proper divisors (1).

166165523 is an equidigital number, since it uses as much as digits as its factorization.

166165523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 166165523 is about 12890.5206644262. The cubic root of 166165523 is about 549.7690744059.

The spelling of 166165523 in words is "one hundred sixty-six million, one hundred sixty-five thousand, five hundred twenty-three".