66738458 has 4 divisors (see below), whose sum is σ = 100107690. Its totient is φ = 33369228.

The previous prime is 66738457. The next prime is 66738467. The reversal of 66738458 is 85483766.

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., 58171129 + 8567329 = 7627^2 + 2927^2 .

It is not an unprimeable number, because it can be changed into a prime (66738457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16684613 + ... + 16684616.

Almost surely, 2^66738458 is an apocalyptic number.

66738458 is a deficient number, since it is larger than the sum of its proper divisors (33369232).

66738458 is a wasteful number, since it uses less digits than its factorization.

66738458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33369231.

The product of its digits is 967680, while the sum is 47.

The square root of 66738458 is about 8169.3609297178. The cubic root of 66738458 is about 405.6256306203.

The spelling of 66738458 in words is "sixty-six million, seven hundred thirty-eight thousand, four hundred fifty-eight".