66674138 has 4 divisors (see below), whose sum is σ = 100011210. Its totient is φ = 33337068.

The previous prime is 66674137. The next prime is 66674143. The reversal of 66674138 is 83147666.

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., 47375689 + 19298449 = 6883^2 + 4393^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66674095 and 66674104.

It is not an unprimeable number, because it can be changed into a prime (66674137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16668533 + ... + 16668536.

Almost surely, 2^66674138 is an apocalyptic number.

66674138 is a deficient number, since it is larger than the sum of its proper divisors (33337072).

66674138 is a wasteful number, since it uses less digits than its factorization.

66674138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33337071.

The product of its digits is 145152, while the sum is 41.

The square root of 66674138 is about 8165.4233203184. The cubic root of 66674138 is about 405.4952798586.

The spelling of 66674138 in words is "sixty-six million, six hundred seventy-four thousand, one hundred thirty-eight".