66654031 has 4 divisors (see below), whose sum is σ = 66953152. Its totient is φ = 66354912.

The previous prime is 66654017. The next prime is 66654047. The reversal of 66654031 is 13045666.

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 66654031 - 2⁹ = 66653519 is a prime.

It is a super-2 number, since 2×66654031² = 8885519697097922, 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 = 66653984 and 66654002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66654001) 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 3 ways as a sum of consecutive naturals, for example, 149226 + ... + 149671.

It is an arithmetic number, because the mean of its divisors is an integer number (16738288).

Almost surely, 2^66654031 is an apocalyptic number.

66654031 is a deficient number, since it is larger than the sum of its proper divisors (299121).

66654031 is a wasteful number, since it uses less digits than its factorization.

66654031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299120.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 66654031 is about 8164.1919992122. The cubic root of 66654031 is about 405.4545138606.

Adding to 66654031 its reverse (13045666), we get a palindrome (79699697).

The spelling of 66654031 in words is "sixty-six million, six hundred fifty-four thousand, thirty-one".