66546799 has 4 divisors (see below), whose sum is σ = 72596520. Its totient is φ = 60497080.

The previous prime is 66546773. The next prime is 66546803. The reversal of 66546799 is 99764566.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66546799 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 (66546709) 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 3 ways as a sum of consecutive naturals, for example, 3024844 + ... + 3024865.

It is an arithmetic number, because the mean of its divisors is an integer number (18149130).

Almost surely, 2^66546799 is an apocalyptic number.

66546799 is a deficient number, since it is larger than the sum of its proper divisors (6049721).

66546799 is a wasteful number, since it uses less digits than its factorization.

66546799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6049720.

The product of its digits is 2449440, while the sum is 52.

The square root of 66546799 is about 8157.6221412860. The cubic root of 66546799 is about 405.2369674544.

It can be divided in two parts, 665467 and 99, that added together give a palindrome (665566).

The spelling of 66546799 in words is "sixty-six million, five hundred forty-six thousand, seven hundred ninety-nine".