66677788 has 24 divisors (see below), whose sum is σ = 119145600. Its totient is φ = 32641008.

The previous prime is 66677777. The next prime is 66677789. The reversal of 66677788 is 88777666.

It is a happy number.

It is a super-3 number, since 3×66677788³ (a number of 24 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84331 + ... + 85117.

It is an arithmetic number, because the mean of its divisors is an integer number (4964400).

Almost surely, 2^66677788 is an apocalyptic number.

It is an amenable number.

66677788 is a deficient number, since it is larger than the sum of its proper divisors (52467812).

66677788 is a wasteful number, since it uses less digits than its factorization.

66677788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209 (or 1207 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 55.

The square root of 66677788 is about 8165.6468206750. The cubic root of 66677788 is about 405.5026791832.

The spelling of 66677788 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred eighty-eight".