66267973 has 4 divisors (see below), whose sum is σ = 66690220. Its totient is φ = 65845728.

The previous prime is 66267959. The next prime is 66267997. The reversal of 66267973 is 37976266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9972964 + 56295009 = 3158^2 + 7503^2 .

It is a cyclic number.

It is not a de Polignac number, because 66267973 - 2⁵ = 66267941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66267913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210888 + ... + 211201.

It is an arithmetic number, because the mean of its divisors is an integer number (16672555).

Almost surely, 2^66267973 is an apocalyptic number.

It is an amenable number.

66267973 is a deficient number, since it is larger than the sum of its proper divisors (422247).

66267973 is a wasteful number, since it uses less digits than its factorization.

66267973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422246.

The product of its digits is 571536, while the sum is 46.

The square root of 66267973 is about 8140.5142957924. The cubic root of 66267973 is about 404.6702045142.

It can be divided in two parts, 662 and 67973, that added together give a triangular number (68635 = T₃₇₀).

The spelling of 66267973 in words is "sixty-six million, two hundred sixty-seven thousand, nine hundred seventy-three".