66045438 has 24 divisors (see below), whose sum is σ = 147715776. Its totient is φ = 21304800.

The previous prime is 66045431. The next prime is 66045487. The reversal of 66045438 is 83454066.

66045438 is a `hidden beast` number, since 6 + 604 + 5 + 43 + 8 = 666.

It is a super-2 number, since 2×66045438² = 8723999761223688, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66045431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58623 + ... + 59738.

It is an arithmetic number, because the mean of its divisors is an integer number (6154824).

Almost surely, 2^66045438 is an apocalyptic number.

66045438 is an abundant number, since it is smaller than the sum of its proper divisors (81670338).

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

66045438 is a wasteful number, since it uses less digits than its factorization.

66045438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118400 (or 118397 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 66045438 is about 8126.8344390667. The cubic root of 66045438 is about 404.2167211232.

The spelling of 66045438 in words is "sixty-six million, forty-five thousand, four hundred thirty-eight".