66140061 has 8 divisors (see below), whose sum is σ = 94970400. Its totient is φ = 40701552.

The previous prime is 66140033. The next prime is 66140069. The reversal of 66140061 is 16004166.

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

It is not a de Polignac number, because 66140061 - 2¹⁴ = 66123677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66140069) 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, 847911 + ... + 847988.

It is an arithmetic number, because the mean of its divisors is an integer number (11871300).

Almost surely, 2^66140061 is an apocalyptic number.

It is an amenable number.

66140061 is a deficient number, since it is larger than the sum of its proper divisors (28830339).

66140061 is a wasteful number, since it uses less digits than its factorization.

66140061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695915.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 66140061 is about 8132.6539948531. The cubic root of 66140061 is about 404.4096688295.

The spelling of 66140061 in words is "sixty-six million, one hundred forty thousand, sixty-one".