66545031 has 16 divisors (see below), whose sum is σ = 101713664. Its totient is φ = 37908864.

The previous prime is 66545029. The next prime is 66545041. The reversal of 66545031 is 13054566.

It is not a de Polignac number, because 66545031 - 2¹ = 66545029 is a prime.

It is a super-3 number, since 3×66545031³ (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 self number, because there is not a number n which added to its sum of digits gives 66545031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66545041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2376 + ... + 11778.

It is an arithmetic number, because the mean of its divisors is an integer number (6357104).

Almost surely, 2^66545031 is an apocalyptic number.

66545031 is a deficient number, since it is larger than the sum of its proper divisors (35168633).

66545031 is a wasteful number, since it uses less digits than its factorization.

66545031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9750.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66545031 is about 8157.5137756549. The cubic root of 66545031 is about 405.2333786752.

Adding to 66545031 its reverse (13054566), we get a palindrome (79599597).

The spelling of 66545031 in words is "sixty-six million, five hundred forty-five thousand, thirty-one".