66473645 has 24 divisors (see below), whose sum is σ = 95312664. Its totient is φ = 44343936.

The previous prime is 66473599. The next prime is 66473653. The reversal of 66473645 is 54637466.

It can be written as a sum of positive squares in 4 ways, for example, as 2569609 + 63904036 = 1603^2 + 7994^2 .

It is not a de Polignac number, because 66473645 - 2⁸ = 66473389 is a prime.

It is a super-3 number, since 3×66473645³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5399 + ... + 12731.

It is an arithmetic number, because the mean of its divisors is an integer number (3971361).

Almost surely, 2^66473645 is an apocalyptic number.

It is an amenable number.

66473645 is a deficient number, since it is larger than the sum of its proper divisors (28839019).

66473645 is a wasteful number, since it uses less digits than its factorization.

66473645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7389 (or 7382 counting only the distinct ones).

The product of its digits is 362880, while the sum is 41.

The square root of 66473645 is about 8153.1371262846. The cubic root of 66473645 is about 405.0884224961.

The spelling of 66473645 in words is "sixty-six million, four hundred seventy-three thousand, six hundred forty-five".