66540395 has 8 divisors (see below), whose sum is σ = 80056080. Its totient is φ = 53093920.

The previous prime is 66540379. The next prime is 66540401. The reversal of 66540395 is 59304566.

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

It is not a de Polignac number, because 66540395 - 2⁴ = 66540379 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15161 + ... + 19050.

It is an arithmetic number, because the mean of its divisors is an integer number (10007010).

Almost surely, 2^66540395 is an apocalyptic number.

66540395 is a deficient number, since it is larger than the sum of its proper divisors (13515685).

66540395 is a wasteful number, since it uses less digits than its factorization.

66540395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34605.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 66540395 is about 8157.2296155006. The cubic root of 66540395 is about 405.2239679771.

The spelling of 66540395 in words is "sixty-six million, five hundred forty thousand, three hundred ninety-five".