66260731 has 4 divisors (see below), whose sum is σ = 66476872. Its totient is φ = 66044592.

The previous prime is 66260729. The next prime is 66260743. The reversal of 66260731 is 13706266.

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 66260731 - 2¹ = 66260729 is a prime.

It is a super-2 number, since 2×66260731² = 8780968945308722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66260693 and 66260702.

It is not an unprimeable number, because it can be changed into a prime (66260231) 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, 107610 + ... + 108223.

It is an arithmetic number, because the mean of its divisors is an integer number (16619218).

Almost surely, 2^66260731 is an apocalyptic number.

66260731 is a deficient number, since it is larger than the sum of its proper divisors (216141).

66260731 is a wasteful number, since it uses less digits than its factorization.

66260731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216140.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66260731 is about 8140.0694714480. The cubic root of 66260731 is about 404.6554627103.

Adding to 66260731 its reverse (13706266), we get a palindrome (79966997).

The spelling of 66260731 in words is "sixty-six million, two hundred sixty thousand, seven hundred thirty-one".