66677799 has 8 divisors (see below), whose sum is σ = 89735040. Its totient is φ = 44036216.

The previous prime is 66677789. The next prime is 66677813. The reversal of 66677799 is 99777666.

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 66677799 - 2¹⁵ = 66645031 is a prime.

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 (66677719) 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, 103539 + ... + 104180.

It is an arithmetic number, because the mean of its divisors is an integer number (11216880).

Almost surely, 2^66677799 is an apocalyptic number.

66677799 is a deficient number, since it is larger than the sum of its proper divisors (23057241).

66677799 is a wasteful number, since it uses less digits than its factorization.

66677799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207829.

The product of its digits is 6001128, while the sum is 57.

The square root of 66677799 is about 8165.6474942285. The cubic root of 66677799 is about 405.5027014821.

It can be divided in two parts, 66677 and 799, that added together give a palindrome (67476).

The spelling of 66677799 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred ninety-nine".