66983954 has 4 divisors (see below), whose sum is σ = 100475934. Its totient is φ = 33491976.

The previous prime is 66983953. The next prime is 66983957. The reversal of 66983954 is 45938966.

66983954 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45938966 = 2 ⋅22969483.

It can be written as a sum of positive squares in only one way, i.e., 48622729 + 18361225 = 6973^2 + 4285^2 .

It is not an unprimeable number, because it can be changed into a prime (66983951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16745987 + ... + 16745990.

Almost surely, 2^66983954 is an apocalyptic number.

66983954 is a deficient number, since it is larger than the sum of its proper divisors (33491980).

66983954 is a wasteful number, since it uses less digits than its factorization.

66983954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33491979.

The product of its digits is 1399680, while the sum is 50.

The square root of 66983954 is about 8184.3725477278. The cubic root of 66983954 is about 406.1223837738.

The spelling of 66983954 in words is "sixty-six million, nine hundred eighty-three thousand, nine hundred fifty-four".