66390295 has 4 divisors (see below), whose sum is σ = 79668360. Its totient is φ = 53112232.

The previous prime is 66390283. The next prime is 66390299. The reversal of 66390295 is 59209366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66390295 - 2¹³ = 66382103 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66390299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6639025 + ... + 6639034.

It is an arithmetic number, because the mean of its divisors is an integer number (19917090).

Almost surely, 2^66390295 is an apocalyptic number.

66390295 is a deficient number, since it is larger than the sum of its proper divisors (13278065).

66390295 is a wasteful number, since it uses less digits than its factorization.

66390295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13278064.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 66390295 is about 8148.0239935827. The cubic root of 66390295 is about 404.9190408717.

The spelling of 66390295 in words is "sixty-six million, three hundred ninety thousand, two hundred ninety-five".