66381274 has 4 divisors (see below), whose sum is σ = 99571914. Its totient is φ = 33190636.

The previous prime is 66381253. The next prime is 66381299. The reversal of 66381274 is 47218366.

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., 65367225 + 1014049 = 8085^2 + 1007^2 .

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 as a sum of consecutive naturals, namely, 16595317 + ... + 16595320.

Almost surely, 2^66381274 is an apocalyptic number.

66381274 is a deficient number, since it is larger than the sum of its proper divisors (33190640).

66381274 is a wasteful number, since it uses less digits than its factorization.

66381274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33190639.

The product of its digits is 48384, while the sum is 37.

The square root of 66381274 is about 8147.4704049785. The cubic root of 66381274 is about 404.9007001382.

The spelling of 66381274 in words is "sixty-six million, three hundred eighty-one thousand, two hundred seventy-four".