66953954 has 4 divisors (see below), whose sum is σ = 100430934. Its totient is φ = 33476976.

The previous prime is 66953951. The next prime is 66953963. The reversal of 66953954 is 45935966.

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., 66797929 + 156025 = 8173^2 + 395^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66953899 and 66953908.

It is not an unprimeable number, because it can be changed into a prime (66953951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16738487 + ... + 16738490.

Almost surely, 2^66953954 is an apocalyptic number.

66953954 is a deficient number, since it is larger than the sum of its proper divisors (33476980).

66953954 is a wasteful number, since it uses less digits than its factorization.

66953954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33476979.

The product of its digits is 874800, while the sum is 47.

The square root of 66953954 is about 8182.5395813280. The cubic root of 66953954 is about 406.0617449186.

The spelling of 66953954 in words is "sixty-six million, nine hundred fifty-three thousand, nine hundred fifty-four".