66774986 has 4 divisors (see below), whose sum is σ = 100162482. Its totient is φ = 33387492.

The previous prime is 66774971. The next prime is 66774989. The reversal of 66774986 is 68947766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 33930625 + 32844361 = 5825^2 + 5731^2 .

It is not an unprimeable number, because it can be changed into a prime (66774989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16693745 + ... + 16693748.

Almost surely, 2^66774986 is an apocalyptic number.

66774986 is a deficient number, since it is larger than the sum of its proper divisors (33387496).

66774986 is a wasteful number, since it uses less digits than its factorization.

66774986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33387495.

The product of its digits is 3048192, while the sum is 53.

The square root of 66774986 is about 8171.5962944825. The cubic root of 66774986 is about 405.6996208957.

The spelling of 66774986 in words is "sixty-six million, seven hundred seventy-four thousand, nine hundred eighty-six".