66973263 has 16 divisors (see below), whose sum is σ = 106492416. Its totient is φ = 36606240.

The previous prime is 66973253. The next prime is 66973273. The reversal of 66973263 is 36237966.

It is an interprime number because it is at equal distance from previous prime (66973253) and next prime (66973273).

It is not a de Polignac number, because 66973263 - 2¹⁰ = 66972239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66973253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68848 + ... + 69813.

It is an arithmetic number, because the mean of its divisors is an integer number (6655776).

Almost surely, 2^66973263 is an apocalyptic number.

66973263 is a deficient number, since it is larger than the sum of its proper divisors (39519153).

66973263 is a wasteful number, since it uses less digits than its factorization.

66973263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138694.

The product of its digits is 244944, while the sum is 42.

The square root of 66973263 is about 8183.7193866848. The cubic root of 66973263 is about 406.1007761839.

The spelling of 66973263 in words is "sixty-six million, nine hundred seventy-three thousand, two hundred sixty-three".