66573645 has 16 divisors (see below), whose sum is σ = 107574912. Its totient is φ = 35153600.

The previous prime is 66573641. The next prime is 66573673. The reversal of 66573645 is 54637566.

It is not a de Polignac number, because 66573645 - 2² = 66573641 is a prime.

It is a super-3 number, since 3×66573645³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66573597 and 66573606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66573641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20457 + ... + 23486.

It is an arithmetic number, because the mean of its divisors is an integer number (6723432).

Almost surely, 2^66573645 is an apocalyptic number.

It is an amenable number.

66573645 is a deficient number, since it is larger than the sum of its proper divisors (41001267).

66573645 is a wasteful number, since it uses less digits than its factorization.

66573645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44052.

The product of its digits is 453600, while the sum is 42.

The square root of 66573645 is about 8159.2674303518. The cubic root of 66573645 is about 405.2914530655.

The spelling of 66573645 in words is "sixty-six million, five hundred seventy-three thousand, six hundred forty-five".