66354399 has 12 divisors (see below), whose sum is σ = 97196112. Its totient is φ = 43612800.

The previous prime is 66354377. The next prime is 66354413. The reversal of 66354399 is 99345366.

It is a happy number.

66354399 is a `hidden beast` number, since 6 + 635 + 4 + 3 + 9 + 9 = 666.

It is not a de Polignac number, because 66354399 - 2⁹ = 66353887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66354199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51282 + ... + 52559.

It is an arithmetic number, because the mean of its divisors is an integer number (8099676).

Almost surely, 2^66354399 is an apocalyptic number.

66354399 is a deficient number, since it is larger than the sum of its proper divisors (30841713).

66354399 is a wasteful number, since it uses less digits than its factorization.

66354399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103918 (or 103915 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 66354399 is about 8145.8209531023. The cubic root of 66354399 is about 404.8460503125.

The spelling of 66354399 in words is "sixty-six million, three hundred fifty-four thousand, three hundred ninety-nine".