66018645 has 160 divisors (see below), whose sum is σ = 154725120. Its totient is φ = 26127360.

The previous prime is 66018643. The next prime is 66018647. The reversal of 66018645 is 54681066.

66018645 is a `hidden beast` number, since 6 + 6 + 0 + 1 + 8 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (66018643) and next prime (66018647).

It is not a de Polignac number, because 66018645 - 2¹ = 66018643 is a prime.

It is a super-2 number, since 2×66018645² = 8716922975272050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66018643) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 904329 + ... + 904401.

It is an arithmetic number, because the mean of its divisors is an integer number (967032).

Almost surely, 2^66018645 is an apocalyptic number.

It is an amenable number.

66018645 is an abundant number, since it is smaller than the sum of its proper divisors (88706475).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66018645 is a wasteful number, since it uses less digits than its factorization.

66018645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 66018645 is about 8125.1858440284. The cubic root of 66018645 is about 404.1620534895.

The spelling of 66018645 in words is "sixty-six million, eighteen thousand, six hundred forty-five".