66738946 has 4 divisors (see below), whose sum is σ = 100108422. Its totient is φ = 33369472.

The previous prime is 66738943. The next prime is 66738979. The reversal of 66738946 is 64983766.

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., 65788321 + 950625 = 8111^2 + 975^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66738946.

It is not an unprimeable number, because it can be changed into a prime (66738943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16684735 + ... + 16684738.

Almost surely, 2^66738946 is an apocalyptic number.

66738946 is a deficient number, since it is larger than the sum of its proper divisors (33369476).

66738946 is a wasteful number, since it uses less digits than its factorization.

66738946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33369475.

The product of its digits is 1306368, while the sum is 49.

The square root of 66738946 is about 8169.3907973606. The cubic root of 66738946 is about 405.6266192798.

The spelling of 66738946 in words is "sixty-six million, seven hundred thirty-eight thousand, nine hundred forty-six".