66663774 has 24 divisors (see below), whose sum is σ = 146181672. Its totient is φ = 21953040.

The previous prime is 66663769. The next prime is 66663797. The reversal of 66663774 is 47736666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20817 + ... + 23804.

It is an arithmetic number, because the mean of its divisors is an integer number (6090903).

Almost surely, 2^66663774 is an apocalyptic number.

66663774 is an abundant number, since it is smaller than the sum of its proper divisors (79517898).

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

66663774 is a wasteful number, since it uses less digits than its factorization.

66663774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44712 (or 44709 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The square root of 66663774 is about 8164.7886684225. The cubic root of 66663774 is about 405.4742683591.

It can be divided in two parts, 6666 and 3774, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 66663774 in words is "sixty-six million, six hundred sixty-three thousand, seven hundred seventy-four".