66036731 has 4 divisors (see below), whose sum is σ = 66198600. Its totient is φ = 65874864.

The previous prime is 66036689. The next prime is 66036787. The reversal of 66036731 is 13763066.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66036731 - 2⁶ = 66036667 is a prime.

It is a super-2 number, since 2×66036731² = 8721699682332722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66036791) 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, 80321 + ... + 81138.

It is an arithmetic number, because the mean of its divisors is an integer number (16549650).

Almost surely, 2^66036731 is an apocalyptic number.

66036731 is a deficient number, since it is larger than the sum of its proper divisors (161869).

66036731 is a wasteful number, since it uses less digits than its factorization.

66036731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161868.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 66036731 is about 8126.2987269728. The cubic root of 66036731 is about 404.1989572434.

Adding to 66036731 its reverse (13763066), we get a palindrome (79799797).

The spelling of 66036731 in words is "sixty-six million, thirty-six thousand, seven hundred thirty-one".