66942545 has 8 divisors (see below), whose sum is σ = 82290600. Its totient is φ = 52247680.

The previous prime is 66942541. The next prime is 66942607. The reversal of 66942545 is 54524966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5837056 + 61105489 = 2416^2 + 7817^2 .

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

It is not a de Polignac number, because 66942545 - 2² = 66942541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (66942541) by changing a digit.

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, 163070 + ... + 163479.

It is an arithmetic number, because the mean of its divisors is an integer number (10286325).

Almost surely, 2^66942545 is an apocalyptic number.

It is an amenable number.

66942545 is a deficient number, since it is larger than the sum of its proper divisors (15348055).

66942545 is a wasteful number, since it uses less digits than its factorization.

66942545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326595.

The product of its digits is 259200, while the sum is 41.

The square root of 66942545 is about 8181.8423964288. The cubic root of 66942545 is about 406.0386792078.

The spelling of 66942545 in words is "sixty-six million, nine hundred forty-two thousand, five hundred forty-five".