166551013 has 4 divisors (see below), whose sum is σ = 167278540. Its totient is φ = 165823488.

The previous prime is 166551001. The next prime is 166551029. The reversal of 166551013 is 310155661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310155661 = 151 ⋅2054011.

It can be written as a sum of positive squares in 2 ways, for example, as 83777409 + 82773604 = 9153^2 + 9098^2 .

It is a cyclic number.

It is not a de Polignac number, because 166551013 - 2¹⁷ = 166419941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166551053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363420 + ... + 363877.

It is an arithmetic number, because the mean of its divisors is an integer number (41819635).

Almost surely, 2^166551013 is an apocalyptic number.

It is an amenable number.

166551013 is a deficient number, since it is larger than the sum of its proper divisors (727527).

166551013 is an equidigital number, since it uses as much as digits as its factorization.

166551013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727526.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 166551013 is about 12905.4644627770. The cubic root of 166551013 is about 550.1938853627.

The spelling of 166551013 in words is "one hundred sixty-six million, five hundred fifty-one thousand, thirteen".