66809295 has 72 divisors (see below), whose sum is σ = 138181680. Its totient is φ = 29756160.

The previous prime is 66809291. The next prime is 66809321. The reversal of 66809295 is 59290866.

It is not a de Polignac number, because 66809295 - 2² = 66809291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66809295.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66809291) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 90036 + ... + 90774.

It is an arithmetic number, because the mean of its divisors is an integer number (1919190).

Almost surely, 2^66809295 is an apocalyptic number.

66809295 is an abundant number, since it is smaller than the sum of its proper divisors (71372385).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66809295 is a wasteful number, since it uses less digits than its factorization.

66809295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 66809295 is about 8173.6953087328. The cubic root of 66809295 is about 405.7690918454.

The spelling of 66809295 in words is "sixty-six million, eight hundred nine thousand, two hundred ninety-five".