66973869 has 12 divisors (see below), whose sum is σ = 99100092. Its totient is φ = 43560000.

The previous prime is 66973867. The next prime is 66973877. The reversal of 66973869 is 96837966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40068900 + 26904969 = 6330^2 + 5187^2 .

It is not a de Polignac number, because 66973869 - 2¹ = 66973867 is a prime.

It is a super-2 number, since 2×66973869² = 8970998257658322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66973867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90382 + ... + 91119.

It is an arithmetic number, because the mean of its divisors is an integer number (8258341).

Almost surely, 2^66973869 is an apocalyptic number.

It is an amenable number.

66973869 is a deficient number, since it is larger than the sum of its proper divisors (32126223).

66973869 is a wasteful number, since it uses less digits than its factorization.

66973869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181548 (or 181545 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 66973869 is about 8183.7564113309. The cubic root of 66973869 is about 406.1020010326.

The spelling of 66973869 in words is "sixty-six million, nine hundred seventy-three thousand, eight hundred sixty-nine".