66049807 has 4 divisors (see below), whose sum is σ = 66554136. Its totient is φ = 65545480.

The previous prime is 66049793. The next prime is 66049831. The reversal of 66049807 is 70894066.

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 66049807 - 2⁷ = 66049679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66049807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66049507) 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, 251968 + ... + 252229.

It is an arithmetic number, because the mean of its divisors is an integer number (16638534).

Almost surely, 2^66049807 is an apocalyptic number.

66049807 is a deficient number, since it is larger than the sum of its proper divisors (504329).

66049807 is a wasteful number, since it uses less digits than its factorization.

66049807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504328.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66049807 is about 8127.1032354708. The cubic root of 66049807 is about 404.2256340977.

The spelling of 66049807 in words is "sixty-six million, forty-nine thousand, eight hundred seven".