66145181 has 8 divisors (see below), whose sum is σ = 70170624. Its totient is φ = 62134720.

The previous prime is 66145169. The next prime is 66145207. The reversal of 66145181 is 18154166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66145181 - 2⁶ = 66145117 is a prime.

It is a super-2 number, since 2×66145181² = 8750369939045522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66145141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6116 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (8771328).

Almost surely, 2^66145181 is an apocalyptic number.

It is an amenable number.

66145181 is a deficient number, since it is larger than the sum of its proper divisors (4025443).

66145181 is a wasteful number, since it uses less digits than its factorization.

66145181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7491.

The product of its digits is 5760, while the sum is 32.

The square root of 66145181 is about 8132.9687691519. The cubic root of 66145181 is about 404.4201038773.

The spelling of 66145181 in words is "sixty-six million, one hundred forty-five thousand, one hundred eighty-one".