66777663 has 8 divisors (see below), whose sum is σ = 89134128. Its totient is φ = 44469824.

The previous prime is 66777661. The next prime is 66777703. The reversal of 66777663 is 36677766.

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 66777663 - 2¹ = 66777661 is a prime.

It is a super-3 number, since 3×66777663³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66777661) 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, 8820 + ... + 14537.

It is an arithmetic number, because the mean of its divisors is an integer number (11141766).

Almost surely, 2^66777663 is an apocalyptic number.

66777663 is a deficient number, since it is larger than the sum of its proper divisors (22356465).

66777663 is a wasteful number, since it uses less digits than its factorization.

66777663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24313.

The product of its digits is 1333584, while the sum is 48.

The square root of 66777663 is about 8171.7600919263. The cubic root of 66777663 is about 405.7050423039.

The spelling of 66777663 in words is "sixty-six million, seven hundred seventy-seven thousand, six hundred sixty-three".