66350531 has 4 divisors (see below), whose sum is σ = 71454432. Its totient is φ = 61246632.

The previous prime is 66350491. The next prime is 66350539. The reversal of 66350531 is 13505366.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66350531 is a prime.

It is a super-3 number, since 3×66350531³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66350494 and 66350503.

It is not an unprimeable number, because it can be changed into a prime (66350539) 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, 2551931 + ... + 2551956.

It is an arithmetic number, because the mean of its divisors is an integer number (17863608).

Almost surely, 2^66350531 is an apocalyptic number.

66350531 is a deficient number, since it is larger than the sum of its proper divisors (5103901).

66350531 is a wasteful number, since it uses less digits than its factorization.

66350531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5103900.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 66350531 is about 8145.5835272864. The cubic root of 66350531 is about 404.8381835899.

Adding to 66350531 its reverse (13505366), we get a palindrome (79855897).

The spelling of 66350531 in words is "sixty-six million, three hundred fifty thousand, five hundred thirty-one".