66546745 has 8 divisors (see below), whose sum is σ = 81048384. Its totient is φ = 52442544.

The previous prime is 66546737. The next prime is 66546763. The reversal of 66546745 is 54764566.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66546745 - 2³ = 66546737 is a prime.

It is a super-3 number, since 3×66546745³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 98989 + ... + 99658.

It is an arithmetic number, because the mean of its divisors is an integer number (10131048).

Almost surely, 2^66546745 is an apocalyptic number.

It is an amenable number.

66546745 is a deficient number, since it is larger than the sum of its proper divisors (14501639).

66546745 is a wasteful number, since it uses less digits than its factorization.

66546745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198719.

The product of its digits is 604800, while the sum is 43.

The square root of 66546745 is about 8157.6188314973. The cubic root of 66546745 is about 405.2368578433.

The spelling of 66546745 in words is "sixty-six million, five hundred forty-six thousand, seven hundred forty-five".