66145066 has 8 divisors (see below), whose sum is σ = 106849764. Its totient is φ = 30528480.

The previous prime is 66145063. The next prime is 66145073. The reversal of 66145066 is 66054166.

It can be written as a sum of positive squares in 2 ways, for example, as 63664441 + 2480625 = 7979^2 + 1575^2 .

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

It is a super-2 number, since 2×66145066² = 8750339512288712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66145063) 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, 1271995 + ... + 1272046.

Almost surely, 2^66145066 is an apocalyptic number.

66145066 is a deficient number, since it is larger than the sum of its proper divisors (40704698).

66145066 is a wasteful number, since it uses less digits than its factorization.

66145066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544056.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 66145066 is about 8132.9616991598. The cubic root of 66145066 is about 404.4198695022.

The spelling of 66145066 in words is "sixty-six million, one hundred forty-five thousand, sixty-six".