66677718 has 32 divisors (see below), whose sum is σ = 135862272. Its totient is φ = 21812000.

The previous prime is 66677693. The next prime is 66677719. The reversal of 66677718 is 81777666.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 94768 + ... + 95468.

It is an arithmetic number, because the mean of its divisors is an integer number (4245696).

Almost surely, 2^66677718 is an apocalyptic number.

66677718 is an abundant number, since it is smaller than the sum of its proper divisors (69184554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66677718 is a wasteful number, since it uses less digits than its factorization.

66677718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its digits is 592704, while the sum is 48.

The square root of 66677718 is about 8165.6425344243. The cubic root of 66677718 is about 405.5025372808.

The spelling of 66677718 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred eighteen".