66540373 has 8 divisors (see below), whose sum is σ = 67099968. Its totient is φ = 65983584.

The previous prime is 66540367. The next prime is 66540379. The reversal of 66540373 is 37304566.

It is an interprime number because it is at equal distance from previous prime (66540367) and next prime (66540379).

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 66540373 - 2¹³ = 66532181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66540379) 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, 80440 + ... + 81262.

It is an arithmetic number, because the mean of its divisors is an integer number (8387496).

Almost surely, 2^66540373 is an apocalyptic number.

It is an amenable number.

66540373 is a deficient number, since it is larger than the sum of its proper divisors (559595).

66540373 is a wasteful number, since it uses less digits than its factorization.

66540373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403.

The product of its (nonzero) digits is 45360, while the sum is 34.

The square root of 66540373 is about 8157.2282670034. The cubic root of 66540373 is about 405.2239233179.

The spelling of 66540373 in words is "sixty-six million, five hundred forty thousand, three hundred seventy-three".