66778007 has 8 divisors (see below), whose sum is σ = 68685456. Its totient is φ = 64876032.

The previous prime is 66777983. The next prime is 66778013. The reversal of 66778007 is 70087766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66778007 - 2⁶ = 66777943 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 (66778037) 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 7 ways as a sum of consecutive naturals, for example, 44288 + ... + 45770.

It is an arithmetic number, because the mean of its divisors is an integer number (8585682).

Almost surely, 2^66778007 is an apocalyptic number.

66778007 is a deficient number, since it is larger than the sum of its proper divisors (1907449).

66778007 is a wasteful number, since it uses less digits than its factorization.

66778007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737.

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 66778007 is about 8171.7811399963. The cubic root of 66778007 is about 405.7057389555.

The spelling of 66778007 in words is "sixty-six million, seven hundred seventy-eight thousand, seven".