66999274 has 4 divisors (see below), whose sum is σ = 100498914. Its totient is φ = 33499636.

The previous prime is 66999271. The next prime is 66999281. The reversal of 66999274 is 47299966.

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., 57108249 + 9891025 = 7557^2 + 3145^2 .

It is not an unprimeable number, because it can be changed into a prime (66999271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16749817 + ... + 16749820.

Almost surely, 2^66999274 is an apocalyptic number.

66999274 is a deficient number, since it is larger than the sum of its proper divisors (33499640).

66999274 is a wasteful number, since it uses less digits than its factorization.

66999274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33499639.

The product of its digits is 1469664, while the sum is 52.

The square root of 66999274 is about 8185.3084242440. The cubic root of 66999274 is about 406.1533430323.

The spelling of 66999274 in words is "sixty-six million, nine hundred ninety-nine thousand, two hundred seventy-four".