66345149 has 4 divisors (see below), whose sum is σ = 71448636. Its totient is φ = 61241664.

The previous prime is 66345143. The next prime is 66345151. The reversal of 66345149 is 94154366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94154366 = 2 ⋅47077183.

It can be written as a sum of positive squares in 2 ways, for example, as 14577124 + 51768025 = 3818^2 + 7195^2 .

It is a cyclic number.

It is not a de Polignac number, because 66345149 - 2⁸ = 66344893 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 (66345143) 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, 2551724 + ... + 2551749.

It is an arithmetic number, because the mean of its divisors is an integer number (17862159).

Almost surely, 2^66345149 is an apocalyptic number.

It is an amenable number.

66345149 is a deficient number, since it is larger than the sum of its proper divisors (5103487).

66345149 is a wasteful number, since it uses less digits than its factorization.

66345149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5103486.

The product of its digits is 77760, while the sum is 38.

The square root of 66345149 is about 8145.2531575145. The cubic root of 66345149 is about 404.8272371916.

The spelling of 66345149 in words is "sixty-six million, three hundred forty-five thousand, one hundred forty-nine".